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How Can Calibration Help Me?

For many people, it isn't clear why there is a need for calibration of measurement equipment. These laser users are not fully aware what the...
11/11/18

Calibration Wavelength

Calibration Method and Estimated Accuracy for Ophir High Power Sensors
Ophir models 5000W, 10K-W and Comet 10K are calibrated using relatively low power lasers ~ 150 - 300W. Using such low power lasers to calibrate the instrument vs. the high power at which the sensors are used raises the question of calibration accuracy. The following explanation clearly demonstrates that the 5000W, 10K-W and Comet 10K are indeed accurate to ±5% over their measurement range. The 5000W and 10K-W sensors work on the thermopile principle, where the radial heat flow in the absorber disk causes a temperature difference between the hot and cold junctions of the thermopile which in turn causes a voltage difference across the thermopile. Since the instrument is a thermopile voltage generating device, it must be linear at low values of output. Therefore, if it is shown to be linear at powers which are a significant fraction of the maximum power, it will necessarily be linear at very low powers and if the calibration is correct at low powers, it will remain correct at high powers as well. On the other hand, although the output may be linear at low powers, there may be a zero offset that, due to the relatively low output at low powers, will cause an error in calibration...
02/03/16

Calibration of Ophir L50(300)A-IPL sensor for use with gel coupled IPL sources

The Ophir L50(300)A-IPL energy sensor shown above when used in GEL mode is designed to measure the energy output of IPL type sources coupled to the patient's skin with optical index matching gel. The sensor has a large Ø65mm aperture with a glass window having an antireflection coating on its rear surface. The IPL source is placed on the window with gel coupling to eliminate the reflections of the top surface of the window. Since it is only a small distance on top of the absorber, even radiation a large angles reaches the absorbing coating. The sensor absorbing coating is of the LP2 type that has high absorbance, high damage threshold and low angular dependence.
04/25/18

Calibration Accuracy of Ophir’s High Power Sensors

An explanation of how we do this is provided below (A). In addition, a recent check of Ophir’s 5000W head by PTB in Germany shows excellent agreement between our calibration and their standards. The details of the correspondence between our sensor and their standard at powers up to 1400W is included here (B).

A. High Power Measurement Calibration Method and Estimated Accuracy of Models 5000W and 10K-W

06/29/14

Calibration Capability at Ophir

Calibration is perhaps the most important of our products. We have a complete line of calibration lasers so that we can always calibrate at or near the customer’s wavelength. These lasers include powers up to 400W and both CW and pulsed lasers. In addition, we have a number of heads calibrated at NIST used as calibration standards. Below is a list of the calibration wavelengths used at Ophir in calibrating our standard catalog heads. Usually the calibration is done at representative wavelengths within a band of wavelengths where the head is spectrally flat. The calibration then applies to any wavelength in this band. The specifications note the maximum additional error in each wavelength band due to variations incalibration between the wavelength of calibration and the wavelength of measurement.

05/19/14

What’s New: Calibration Portal

A quote attributed to Heraclitus, a Greek philosopher, states that change is the only constant in life. Change often comes as a surprise and is seen as a painful part...
03/06/16

How Can Calibration Help Me?

A common concern that I have heard throughout my years with Ophir-Spiricon is that many people do not understand the necessity of calibration. They do not understand...
01/13/16

Spectral Wavelength Calibration

All absorbers used in power/energy measurement are not entirely flat spectrally, that is, they vary in absorption with wavelength. For this reason...
11/06/17

Calibration of Ophir Terahertz Sensors

Terahertz (THz) applications - till recently mainly still in the R&D phase - are beginning to emerge into the light of the commercial and...
11/18/19

When sending in a Power Meter for repair and/or re-calibration

Note the settings on your meter and sensor before sending the units in for calibration. To simplify the reintegration of your Ophir measurement instruments back into your system, please record your settings and parameters before sending your devices in for calibration.

During the calibration process occasionally we change the settings on an instrument back to the default. This means that when you receive the equipment back it will likely not start up as you had it. The end-user will see a change in how the meter and/or sensor are behaving. The difference could be as simple as changing the Average function, so the readings now appear less stable.

06/29/14

Recalibration and Repair: Your Most Cost-Effective Calibration Solution

At Ophir-Spiricon, we realize that our customers are the lifeblood of our company. Because of this partnership, we are driven to provide quality products and services in the most cost-effective way possible. To help you minimize the costs of maintaining equipment, we have put into place many features of our services to support your goals.
02/01/16

Laser Power Sensors introduction

As described in the general introduction, the thermopile sensor has a series of bimetallic junctions. A temperature difference between any two junctions causes a voltage to be formed between the two junctions. Since the junctions are in series and the «hot» junctions are always on the inner, hotter side, and the «cold» junctions are on the outer, cooler side, radial heat flow on the disc causes a voltage proportional to the power input. Laser power impinges on the center of the thermopile sensor disk (on the reverse side of the thermopile), flows radially and is cooled on the periphery. The array of thermocouples measures the temperature gradient, which is proportional to the incident or absorbed power. In principle, the reading is not dependent on the ambient temperature since only the temperature difference affects the voltage generated and the voltage difference depends only on the heat flow, not on the ambient temperature.

05/19/14

Bridging the THz Gap in Radiometry

The Renowned German standards laboratory Physikalisch-­‐Technische Bundesanstalt – PTB, has now developed a highly accurate calibration standard for calibrating Terahertz radiation based on a modified Ophir 3A-­‐P meter.

05/19/14

Raising the Standard of Service

At Ophir-Spiricon we have raised the standard of service. One of the pillars of our business model is customer satisfaction, and we firmly believe that the level of...
02/01/16

Expanded ISO Accreditations

At Ophir-Spiricon we pride ourselves on providing quality in every step of our service to you. To validate and measure our commitment to quality, Ophir-Spiricon has...
02/01/16

Can a Speeding Driver Avoid Paying a Fine by Claiming the Police LIDAR Meter was Incorrect?

Most drivers get caught speeding at some time during their driving experience. A common scenario occurs when a policeman uses a LIDAR speed meter to indicate that a car is over the speed limit. When the car is caught and pulled over, the driver shows a surprised, innocent face, attempting to get out of a fine. But when the policeman shows the driver the reading on his LIDAR speed meter he knows he’s going to have to pay. Can the driver claim that he was within the speed limit, claiming that the LIDAR instrument is not calibrated recently?

Various LIDAR instruments may be used to measure speed, direction of motion of a motor vehicle, and the distance to another moving vehicle. LIDAR instruments are used by the police to enforce speed limits and to analyze car crashes or crime scenes in order to reconstruct the scenes.

05/19/14

Common Reasons for Photodiode Sensor Damage or Out of Tolerance Conditions

We have included this document with your recent calibration order because we have noticed an out of tolerance condition obtained from your equipment when returned for calibration. This document was created to assist our valued customers in the proper care and maintenance of Ophir photodiode sensors. The following information is for reference only. If you have any reason to believe that the sensor is no longer performing within the original specifications, we always recommend that you send it in for repair and/or recalibration by our trained technicians to bring the unit back to the proper NIST traceable standards.

Ophir photodiode sensors can be used for many years without any repairs when used with the proper laser optical setup. Many of our customers have sensors that are using their original absorber that are over ten years of age. We hope that this document will enable you to also enjoy the long life and reliable results that Ophir- Spiricon is known for.

05/19/14

Longer Length Sensor Cables

The Ophir sensors are provided with a 1.5m cable between the sensor and the smart head connector. When a longer length cable is needed it can be provided, as long as it is within operational limits. However it is not possible to add an extension to the cable, because that moves the smart head connector away from the meter or interface unit which can degrade the smart head functionality or disable it.

06/29/14

Effect of Ambient Conditions on Laser Measurements

We are often asked about the specified ranges of various ambient conditions (temperature, humidity, etc.) for Ophir instruments. In this article we will clarify the effects of these conditions on laser measurements, so you’ll be able to use your Ophir laser measurement instrument effectively.

06/29/14

The Telescope Array Project

By Stan Thomas, University of Utah – Physics Department Thomas@physics.utah.eduThe Telescope Array...
05/31/15

Ophir-Spiricon Laser Measurement in Medical Laser Service

The global medical industry incorporates thousands of lasers into its arsenal of treatment tools. Wavelengths from UV to Far-infrared are used for everything from Lasik eye surgery to cosmetic skin resurfacing. Visible wavelengths are used in dermatology and ophthalmology to target selective complementary color chromophores. Laser powers and energies are delivered through a wide range of fiber diameters, articulated arms, focusing handpieces, scanners, micromanipulators and more.

06/29/14

Laser Power / Energy Measurement Today

The laser industry is advancing steadily with new wavelengths, higher powers and energies, and new applications all the time. As the power, energy and variety of new lasers advances, so measurement of these lasers has to advance.

05/19/14

Reimaging UV Laser Beam Profiling

Ophir Photonics offers a number of solutions for profiling UV laser beams. Spot sizes from 0.15mm to over 25mm can be safely profiled without the risk of camera sensor...
06/19/16

VCSEL Measurement Solutions

Vertical Cavity Surface Emitting Lasers (VCSELs) are a type of semiconductor laser diode. Unlike edge emitting laser diodes, VCSELs emit upwards and thus can be easily packaged as emitter arrays containing hundreds of emitters on a single chip.
01/21/19
11/06/17

The calibration process insures that a sensor is working within in-tolerance performance, similar to “as new” condition. Typically when there is a damaged area on a power sensor disk, that particular area will exceed the disk uniformity specification, which is ±2% across the active surface area of the disk, and therefore (with a damaged area on a sensor) it will be rejected for calibration because it is outside of the acceptance criteria to pass the calibration procedure requirements.

05/26/15

The Power Accuracy of +/-3% refers to the absolute uncertainty of the measured value. For example, for a 2 Watt reading, the actual "true" value would be between 1.94 W to 2.06 W (with reference to NIST, to which all our calibration is traceable). This assumes the reading is from about 5% of full scale up to full scale. It should be noted that our accuracy specification is in general based on 2 sigma standard deviation.

Repeatability of the measurement (assuming the laser itself is perfectly stable) is limited in the best case by the power noise level of the sensor, and is typically better than  +/- 1%  depending on the thermal stability of the environment. Stability at higher powers from the middle to the top of the range of the sensor head is usually better than the low end. This is due to small temperature variations having less of an effect as they are proportionally a lower percentage of the total power. For more information, refer to our Web tutorial at: https://www.ophiropt.com/laser-measurement-instruments/laser-power-energy-meters/tutorial/calibration-procedure

05/28/15

After numerous requests for re-calibration of M2 systems, in 2008 Ophir-Spiricon started a recalibration program for its M2 systems. This program allows the equipment to be sent back to the factory to be inspected, lubricated and re-calibrated. This enables customers to comply with their ISO regulations. Please click the below link to be directed to a section of our web site where you can request an RMA to return your equipment for re-calibration.
https://www.ophiropt.com/laser-measurement-instruments/customer-support/...

05/26/15

The answer to this question is two-fold. First of all the recalibration process accomplishes the recalibration of the sensor and returns it to "as-new" working condition. If there is surface damage on the sensor disc that creates areas of non-uniformity exceeding the uniformity across-the-surface specification, then the disc needs to be replaced, even though the accuracy performance of the sensor is not out-of-tolerance. Secondly, many applications require that sensors be found in-tolerance during the calibration process, or else deviation explanations are required and/or costly recalls may need to be implemented. The calibration process is intended to help maintain the sensors within tolerance if at all possible.

05/26/15

All absorbers used in power/energy measurement are not entirely flat spectrally, that is, they vary in absorption with wavelength. For this reason, Ophir measuring sensors are usually calibrated at more than one wavelength. If the absorption changes only slightly with wavelength, then we define wavelength regions such as <800nm, >800nm and give a calibration within these regions. In that case, the error in measurement between the wavelength the device was calibrated for and the measurement wavelength is assumed to be within the primary wavelength calibration error.

11/15/20

The Pyrocam IIIHR and IV have a Certificate of Calibration for the detector recess distance and a Certificate of Camera Performance. See the attached examples.
 
We do certify the Pyrocam IIIHR and IV for operational performance against our internal standards that new equipment must meet and recommend annual re-certification for continued optimal performance. Because this is a Certificate of Camera Performance, it is up to the customer to decide if they want to send the camera back on an annual basis for re-certification. See our Knowledge Center article #9039 for more information. https://www.ophiropt.com/laser--measurement/knowledge-center/article/9039

03/21/17

The ModeCheck background calibration cycle may get stuck due to some environmental conditions which cause the wand position to become difficult to determine. You may be able to restore operation by cleaning the back side of the wand where the wand passes the optical sensor.

05/26/15

An explanation of how we can accurately calibrate at a fraction of the maximum power is given in our catalog introduction and on our website. In addition, in order to be sure of the calibration at higher powers, we have to know if the linearity of our sensors is within specification. For this purpose we have a 1500W sensor calibrated at various powers at a standards lab. Using a beam splitter and a 15,000 Watt laser we periodically check the linearity or our highest power sensors against this secondary standard.

06/09/14

All Ophir power meters, including photodiode power meters, have an air gap between the fiber tip and the sensor. Therefore they measure the power emitted by the fiber into the air and do not take into account any reflection losses there are in the fiber. Therefore, if in actual use, the fiber will be coupled with no loss to another element, then the losses should be added to the reading. These losses are usually about 4%. Thus if the reading on the Ophir meter is say 100mW, then in lossless use, the real power will be 104mW.

06/09/14

The Ophir integrating sphere sensors, models 3A-IS and 3A-IS-IRG have a white diffuse reflecting coating on the inside of the integrating sphere. The sensitivity of the sensor is quite sensitive to the reflectivity of the coating. If the coating absorption goes up 1%, it can cause a 5% change in reading. Therefore, care must be taken not to soil or damage the white coating of the sensors. Also it may be a good idea to send the sensors for recalibration yearly.

03/12/20

Customers often measure the same laser with 2 different Ophir sensors, both of which are specified to be within calibration. Let’s say that both of the sensors are specified to have a calibration uncertainty of ±3%. Do I expect the difference in reading between them to be less than 3%? On the first thought, this is what one might expect. However this is not necessarily so.
 
First of all, when we specify a calibration accuracy of ±3%, we are talking about a 2 sigma uncertainty, i.e. the readings of various sensors will be within a bell curve with 95% of all sensors reading within 3% of absolute correct calibration and 5% reading outside this accuracy. Thus there is a small chance that the meter will not be reading within 3% of absolute accuracy.
 
A more important reason is that the two sensors’ calibration error may be in two different directions and thus show a larger discrepancy between them than 3%. Say one sensor has been calibrated and reads 2.5% above absolute calibration and the other 2.5% lower than absolute calibration. Both of the sensors are within the specified ±3% absolute calibration but they will still read 5% differently from each other.
 
If we do statistical analysis, the analysis will show that there is in fact a probability of >16% that two correctly calibrated sensors will differ in reading from each other by more than 3% and a probability of over 6% that the sensors will differ in reading between each other by more than 4%.

01/18/18

The starting point - the calibration measurements themselves (using the moderate-power lasers) - are all based on NIST-calibrated “master” sensors.
Basing high-power calibration accuracy on lower power calibration measurements is valid, subject to the condition that the sensors are linear all across the full power range.
A series of detailed tests have confirmed that indeed these sensors are highly linear, all the way up to the highest powers for which they are rated.
Since the thermal sensors have been shown to be linear over their entire range of powers, it follows that if the calibration is correct at low powers, it will remain correct at high powers as well.

06/03/15

The Ophir specification on accuracy is in general 2 sigma standard deviation. This means, for instance, that if we list the accuracy as +/-3%, this means that 95% of the sensors will be within this accuracy and 99% will be within +/-4%. For further information on accuracy see https://www.ophiropt.com/laser-measurement-instruments/laser-power-energy-meters/tutorial/calibration-procedure and https://www.ophiropt.com/laser--measurement/knowledge-center?search=calibration&=SEARCH

06/01/15

When using a camera with a lens, the operator must perform a spatial calibration to obtain accurate dimensional results. To do this, you must set up the camera lens system to view an object of a known dimension. The object to be viewed must contrast against its background to yield well defined edges. Use the following procedure.

  • In the Camera Dialog Box, set the "Pixel Scale" V value to 1.
  • In the Beam Display Toolbar Dialog Box check "Cursors" and "Crosshair"
  • In the Camera Dialog Box set the "Resolution" to 1X.
  • On the Beam Display Toolbar set "Crosshair" to Manual and "Cursor" to Manual.
  • Set the LBA into "CW Mode" and start it "Running."
  • Place an object containing at least one known dimension into the imaging plane of the camera lens system, and focus the optics. (A good object might be a circular disk with a diameter of 1cm.) The object should be large enough to fill over 50% of the display height. You can hardware zoom to enlarge the object if necessary. Orient the object so that the calibration dimension aligns vertically on the Y axis cursor. You can use the Pan and Cursor controls to achieve a good alignment.
  • With the mouse and left button move the cursor to one edge of the object
  • With the mouse and left button move the crosshair to the object's opposite edge. The Delta = value on the screen will contain the pixel count between the known calibration dimensions. Divide this number into the calibration dimension to yield the correct "Pixel Scale" value.
  • For example, if a 1cm distance produced a delta count of 176, then the "Pixel Scale" value would become .00568cm, or 56.8µm.
06/01/15

I would also like to set up a beam code to take 10 pictures once a day for 30 days, without human intervention.

Set your camera to capture at 30Hz if it has a frame format that supports 30Hz: 

Select an attached power meter or use the manual calibration tool if power calibration is required. If calibration is required counts will turn to an actual power reading for the total frame power or energy: 

You said you need an average so I will assume "Total" is the item you are averaging. It could be any results just enable the one(s) you need: 

You need to average 100 shots at 30Hz each hour so you will need to use the Burst Capture feature. The controls below (as currently set) will capture 100 frames every hour in results priority mode (what you need for this requirement). 

Provide a log file name here: 

Set frame averaging to 100 because you want to average the frames collected. This will produce results that are an average of 100 samples. 

Set logging to continuous as you will stop it manually after 30 days. 

You could also do the math (Days x Logs Per Day = Total logs or 30x24=720) and figure out how many samples a 30 day log would produce at this rate and place this number in the box below in place of the 1 you see now. Then click on the "Folder/Play-Button" icon to the right of the spin buttons to enable "Stop after X Logs" 

When you are ready to start logging, make sure the data source is running and click on the top middle icon you see here, which is the results logging button (has the 1.2 in the icon): 

When you are running and click the "Log Results" button the logging to disk will begin.

2D and 3D images (Pro release to introduce image logging) can also be logged by enabling the required image file types here: 

Use Excel to import the data from the log file with comma delimiting and you will see the following type of log: This log of total frame counts was made using burst capture of 100 frames every 5 seconds.

Tip: When you setup a log in this way you will only see the frames that are logged appear in the BeamGage beam displays. If you are logging one sample an hour you will not see a lot of activity in the beam display windows. Not to worry, you have the power of Multi-Clienting at your finger tips so you can minimize this instance of BeamGage and let it go on logging in the background (maximize it again when you want to see the last frames logged). Now, launch a new instance of BeamGage and connect to the same camera. Because the camera is set at 30Hz you will see a 30Hz video feed in the second instance of BeamGage. This will allow you to monitor in real-time while you are logging in slow-time.

Behold, the power of subscription rate when combined with logging and multi-clienting.

02/14/21

Each Ophir sensor data sheet states its accuracy, typically something like ±3%. This refers to the absolute uncertainty of the measured value. For example, for a 2 Watt reading, the actual "true" value would be between 1.94 W to 2.06 W (with reference to NIST, to which all our calibration is traceable). To this must be added other uncertainties, if they exist. This assumes the reading is from about 5% of full scale up to full scale. It should be noted that our accuracy specification is, in general, based on a 2 sigma standard deviation.
 
This White Paper explains in detail exactly how we arrived at the accuracy numbers we specify, and what exactly they mean: Ophir Power/Energy Meter Calibration Procedure and Traceability/Error Analysis.

08/09/18

The short answer is…sort of.
There are 2 main issues that link measurement accuracy to beam diameter:

  • Uniformity of the sensor’s response across the aperture
  • Fraction of the sensor’s aperture that the beam fills

Because there is a tolerance on surface uniformity across any sensor’s aperture (there always is), beams of different sizes will of course be affected differently since they take up different chunks of the total surface. The actual uniformity spec varies from sensor to sensor. In general, the uniformity is better than +/-2% over the central 50% of the area (70% of the diameter), and for many sensors considerably better than this. For more information see our tutorial at https://www.ophiropt.com/laser-measurement-instruments/laser-power-energy-meters/tutorial/calibration-procedure.
 
Regarding the recommended portion of a sensor’s aperture that a beam should ideally fill: There is a balance here between several factors. All other things being equal, an ideal fraction of sensor aperture would be somewhere between 1/3 and 2/3. Please see this short video for a clear explanation.

05/02/16

On the Certificate of Calibration there is also listed the same “D” to indicate that the diffuser is installed for this wavelength calibration. If the diffuser cannot be removed, the wavelength remains the standard wavelength. An example would be: 532 for a 532 nm source.

05/26/15

With normal usage we recommend calibrating every 12 months. To accommodate shelf time and shipping time new manufactured product comes with a calibration sticker that shows a recalibration period of 18 months from manufacturing. However this does not negate the recommended 12 month recalibration interval should you receive the product with more than 12 months remaining on the new manufactured calibration sticker.

06/09/14

The PD300 series of photodiode-based sensors are calibrated with a full spectral curve using a scanning monochromator (plus a few laser "anchor points").

 

The wavelength ("Laser") setting tells the meter what wavelength is being used and hence what calibration factor to apply when a measurement is underway. It does not, however, physically limit the possibility of other wavelengths from entering. All light (within the sensor's specified range of course) entering the detector will be measured; the meter will apply the calibration factor meant for the selected wavelength, "thinking" that only that wavelength is present.

 

In other words, these sensors assume a monochromatic light source. Their relative spectral response is not flat and they are therefore not suited for broadband beams.

 

So, if you want to check one wavelength from a broadband source, you will need to use a wavelength filter that only passes that wavelength. Then you should set your meter to the appropriate wavelength to account for the detector's relative sensitivity.

02/14/21

If you can’t just arrange for a feedthrough of the cable through the chamber wall, then you’ll need to have panel-mounted connectors on the inside and outside of that wall; one cable segment connects from the sensor to the connector on the inside of the wall, and another cable segment continues from there to the meter. The trick is where/how to split the cable (you can see a short video about this question here. The starting point is that the D15 connector with the sensor’s EEPROM inside must be connected to the meter, and any split will be elsewhere along the cable. From there, for power sensors the simplest solution is to cut the sensor cable between the D15 smart plug and the sensor itself. There are only 2 internal wires and a screen/shield to connect, and the panel-mounted connectors will be simpler. (If you need to do this on multiple sensors, you’ll need to be careful to keep each sensor paired with its own D15 plug, as the EEPROM in the D15 plug is where the individual sensor’s calibration data is stored.)
 
More generally, such as for other sensor types, the usual way to approach this would be to use a “split cable” solution, where there would be a panel-mounted D15-to-D15 feedthrough connector on the vacuum chamber panel (the 2 D15 connectors would be “dumb”, i.e. without the EEPROM inside that holds the calibration data – their purpose would be just to feed-through), and from the outer connector there would be a second segment of cable terminating in a “Smart” D15 connector that connects to the meter. Consult with Ophir if this is of interest for you.

01/13/16

The old pyro sensors and the newer PE-C sensors are almost identical; the differences between them are as follows:

  1. More compact
  2. User Threshold – minimum energy threshold (below which the sensor will not trigger) can be selected according to users' needs
  3. Measures longer pulses (up to 20ms depending on model)
  4. Has up to 5 pulse width settings as opposed to only 2 pulse width settings

Disadvantages:
Smaller size and therefore:

  • May need a heat sink (P/N 7Z08267) in order to stand up to higher average powers
  • May need a mechanical size adapter (P/N 7Z08273) if it must fit into an existing mechanical jig designed for the older models

Meters and Software Support:
StarLite, Juno, Vega, & Nova II fully support the Pyro-C series. Laserstar, Pulsar, USBI, Quasar, and Nova / Orion with adapter* partially support the Pyro-C series:

  • Only 2 of the 5 pulse width settings are available
  • Lowest measureable energy cannot be selected (no User Threshold).

StarLab software supports both Pyro-C and older pyro series.

*Note: The PE-C series will only operate with Nova / Orion meters with an additional adapter Ophir P/N 7Z08272 (see details in Ophir website).

Wavelength Setting Names:
If you have your own software for communicating with the sensor, it may be important to note that for some models, the names of the wavelength settings are a bit different between the old pyro and the new PE-C, even though they mean exactly the same thing.

For example, with diffuser OUT, the settings in the PE50BB-DIF-V2 are called “<.8u” (i.e. visible, represented by a calibration point at 532nm that covers the full visible range), and “106” (i.e. 1064nm), while in the PE50BB-DIF-C these same settings are called “532” (i.e. 532nm, the calibration point for the visible) and “1064”.

05/08/17

Our recalibration process is to not automatically upgrade the firmware in meters when they are sent in for recalibration, unless specifically requested to upgrade it. The reason for this is that we support many companies, such as medical companies, that have equipment validation processes that don’t allow changing the firmware version from the currently validated version. If you do want the latest firmware version installed, we will do that at no additional charge (for meters which are upgraded electronically) if it is specifically requested on the RMA request checklist form. For older meters (such as the Nova) that are upgraded through changing the EEPROM, a nominal fee is added, if firmware upgrade is requested. Note; upgrading the firmware does not affect the calibration.

04/26/22

This is one of our most-often-asked questions (we don’t call these FAQ's for nothing…). In general terms: There are a few factors that contribute to the final overall uncertainty in your measurement. For the sensor, these include, among others (and these are all mentioned in the sensor's datasheet):

  • The "basic" specified measurement accuracy (a typical value might be +/- 3%)
  • Additional uncertainty for wavelengths in the specified range that are not actual calibration points (this and those that follow are specified in the datasheet as "up to…x%" or similar)
  • Linearity
  • Additional error with frequency (for energy sensors)
  • Uniformity across the aperture surface

Then it starts getting complicated… Some of these numbers would get combined statistically, as root-of-sum-of-squares. Basically, that happens when the errors are random (so one factor might in one case introduce some error in the high direction, but another factor might at the same time be introducing an error in the low direction). However, if you are for example working right near the top of a given energy range, or right near the maximum frequency specified for the sensor, then the additional error being introduced is not random at all; in such cases the numbers would have to be added arithmetically. For example, to give this some meaning:
Say you are working at <70% of the maximum energy of the range and <70% of the maximum pulse rate. In that case, the linearity and frequency-dependent errors can be assumed to be random. If the beam is, say, around 1/4 of the aperture and is centered, the uniformity error can be ignored (that's how we set it up when we calibrate the sensor, so by working in similar conditions you've eliminated some variables). In that case you may use statistical combination of errors to compute the expected total error. For instance if the stated "basic" measurement accuracy is ±3%, the stated linearity is ±1%, and the stated pulse rate dependence is ±1%, then the 2 sigma total error can be taken to be √ [(0.03)² + (0.01)² + (0.01)²] = 3.3% - only slightly higher than the "basic" 3%. If, on the other hand, the pulse rate or power approaches the maximum permitted, then you must take the maximum value as the expected total error, i.e. 0.03 + 0.01 + 0.01 = 5% in the above example. Just to add: Since the meter error is so low (typical electrical accuracy is specified as +/-0.25% new and +/-0.5% after a year), it can be ignored in most cases. You can find more in-depth information in this article and in this On-Demand Webinar.

04/11/19

The spectral range stated at the beginning of the spec indicates the range of wavelengths for which the sensor can be usefully used even if the exact calibration is not specified for that range. This means that over the calibrated wavelength range, the accuracy is specified and guaranteed. Over a wider useful wavelength range, the sensor is usable but no accuracy is guaranteed. In general over this wider range, the accuracy will be within up to ±15%.

03/26/19

The spectral range stated at the beginning of the spec indicates the range of wavelengths for which the sensor can be usefully used even if the exact calibration is not specified for that range. This means that over the calibrated wavelength range, the accuracy is specified and guaranteed. Over a wider useful wavelength range, the sensor is usable but no accuracy is guaranteed. In general over this wider range, the accuracy will be within up to ±15%.

11/06/17

StarLab 3.50 does include new features which may require a firmware upgrade of the meter or PC interface, I.E. Juno, in order to operate with it. The required firmware is included with StarLab 3.50, but you do need to click on the More… link in the Select Device(s) menu in order to launch the Diagnostics menu and then proceed with the Upgrade firmware procedure. After performing the firmware upgrade, the meter or PC interface will connect with StarLab and operate normally. Note; Upgrading the firmware will not affect calibration.

09/14/17

The analog output of the meter - using the mating connector provided – gives a voltage signal proportional to the actual reading (it is in fact just a D/A translation of what is being displayed), so it represents a fully calibrated reading. The full scale value is a function of the meter being used and the power range it is on. With the StarBright, Vega and Nova II, for example, the user can select full scale analog output voltage ranges of 1v, 2v, 5v or 10v, and the 100% level of the chosen power scale is scaled to the full scale voltage. For example: if you choose 5V full scale analog voltage range, and your sensor is set to a 50W full scale power range, then you will have 5V = 50W or 0.1 V/W. It will vary according to the chosen power range and chosen full scale voltage range. The electrical accuracy is stated in the specification (see the User manual) as ±0.2% (of reading) ±0.3% of full scale volts (in addition to the calibration accuracy of the sensor’s reading itself).

03/21/17

Because of the design of the lenses for the new BeamSquared, you will be able to use lenses on multiple systems. We have included an RFID chip on each lens which holds the information for that lens. We have also programmed the BeamSquared optical trains to have their calibration information stored in the device. With this improvement the configuration files for pairing optical trains and lenses are no longer required making lenses interchangable.

03/14/17

An unused port should be closed, to prevent unwanted light from entering the sphere. Closing it with a diffuse white port plug, however, adds the surface area of that plug to the (diffuse white) effective area of the sphere that is doing the “integrating”. For a calibrated integrating sphere sensor, this change in the behavior of the sphere changes its calibration, and results in incorrect readings. In such applications, a black “Port Cover” should be used.

07/25/16

It is NOT recommended to interchange the lenses between units. The M2-200s lenses are unique and serialized for the particular M2-200s unit they are provided with. Each lens includes calibration information for the Effective Focal Length and Back Focal Length that are entered into the specific serialized configuration files for each M2-200s. If lenses are interchanged between units, accuracy can be degraded. If lenses are lost or broken, we can replace them. If specific configuration files are lost, we do keep backup copies of them and can email them to you.

06/15/15

With Ophir's Smart Head technology sensors can be interchanged between different meters easily. The calibration and setting information is stored in the sensors Smart Head connector so it moves with the sensor to the new meter. It is recommended that you power off your Nova meter before removing the sensor, but the new Nova II and Vega meters detect that a sensor has been removed or attached and will power cycle themselves when doing this.

06/03/15

Ophir meters and sensors are calibrated independently. Each meter has the same sensitivity as the other within about 2 tenths of a percent. Each sensor is calibrated independently of a particular meter with its calibration information contained in the DB15 plug. When the sensor is connected to the meter, the meter reads and interprets this information. Since the accuracy of our sensors is typically +/-3%, the extra 0.2% error that could come from plugging into a different meter is negligible and therefore it does not matter which calibrated meter we use with a particular calibrated sensor.

05/28/15
With the addition of optics, the largest laser beam you can measure is limited by the amount of reduction afforded by the optical setup.  With the use of supporting equipment such as beam reducers or CCTV lenses a spatial calibration can be performed, giving the equivalent pixel pitch with the lenses in place.  Sometimes an imaging target may be needed to make sure you are focusing the imaging optics to the correct location. 
 
In most applications the beam size is less than 10mm. When a beam gets larger, a reducing telescope can be used to bring it down to a size to fit on the array. Our largest array camera, the L11059, has an array size of 26x39mm.
05/27/15

The Quasar is no different than the other instruments that have electronic components: it requires annual recalibration. But it’s up to the customer whether to do this or not. We know that the calibration of the instruments degrades somewhat over time, as shown in the datasheet. This may or may not affect your particular application. To maintain compliance with ISO and other standards, we highly encourage annual recalibration.

05/26/15

Generally, our sensors are calibrated (traceable to NIST) to within ±3% accuracy 2 sigma which means that 95% of the sensors are accurate within ±3%. However, if your application requires very high accuracy, we also offer something called “double calibration” which can bring the error down to ±2%.

05/21/15

Select the range that contains your wavelength. The sensors have coatings on them that have been characterized and for any wavelength within that range the sensor will be within calibration tolderance including variations in sensitivity within that range. When there is a difference in sensitivity that exceeds the allowable tolerances, a new wavelength range is created and a calibrated for.

06/23/14

There are a number of options, depending on the purpose.

  • In many cases, the simplest solution could be to make use of the analog output of the meter – that gives a voltage signal proportional to the actual reading (it is in fact just a D/A translation of what is being displayed), so it represents a fully calibrated reading. The full scale value is a function of the meter being used and the power range it is on.
  • The "SH to BNC connector" (Ophir P/N 7Z11010) simply takes the raw output from the detector element and sends it to the scope. It bypasses the sensor's EEROM which contains the calibration data, so it essentially turns the sensor into an uncalibrated "dumb" analog sensor. It should be noted, though, that in some cases we could be talking about a signal to the scope that may be low, perhaps even near the noise level of the scope, which limits the usefulness of this method at low powers.
  • If the need is to see the pulse width – the temporal profile – the solution (assuming applicable specs) is to use an approprinte temporal sensor connected to a scope; you can point it anywhere where it will catch some backscatter from your laser, and you'll see the pulse temporal form as it really is.
06/09/14

For HE between 0.625 and 1um, the window transmits too much and the absorption drops by ~10%. Because of this, the thermal heat sink compound behind the absorber can dry out. If the power and energy is kept to 1/10 of maximum and the calibration is not important, the sensor can be used in this spectral region.

06/09/14

First, clean the absorber surface with a tissue, using Umicore #2 Substrate Cleaner, acetone or methanol. Then dry the surface with another tissue. Please note that a few absorbers (Pyro-BB, 10K-W, 15K-W, 16K-W and 30K-W) cannot be cleaned with this method. Instead, simply blow off the dust with clean air or nitrogen. Don't touch these absorbers. Also, HE sensors (such as the 30(150)A-HE-17) should not be cleaned with acetone.
 
Note: These suggestions are made without guarantee. The cleaning process may result in scratching or staining of the surface in some cases and may also change the calibration.

05/26/15

How long you fire the laser into the meter depends on you. Some manufacturers do it 100% of the time via a beam splitter. That way they have a constant feedback system to allow them to not only monitor the power output, but also to control it so the laser is stable. Other people only do it for a short time to verify the setting is producing the correct amount of power. For different applications different sensors would be needed. For continual monitoring we would recommend a sensor that is designed to have the laser on it all the time. For short time measurements, a sensor designed for short use would be more ideal. For lasers that are pulsed, we recommend firing the laser a couple of times to get an understanding of the pulse to pulse change as well as being able to monitor the average. However, some applications only want to verify the energy setting, so they only fire the laser once to see if they are ready to go. Again, the decision is up to you. Processing the information in the PLC is completely up to you. Usually this requires some form of calibration so you can take the information you are delivering to the PLC and correlate it with your operator display. I.e. Volts/Watt. How many Volts from the sensor is equal to X amount of Watts the laser just produced.

03/18/18

The 10K-W and 15K-W sensors are calibrated at wavelength 1.064μm, but since they relatively flat spectrally throughout the near infrared, this setting can be use anywhere in the spectral range 0.8 – 2μm. This is represented by the wavelength setting “NIR”. (They are also calibrated at 10.6um for CO2 lasers.)

 
Approximately 3.2% of the light impinging on the sensor is backscattered in a diffuse manner. The “Ophir 10K-W/15K-W Scatter Shield” (P/N 7Z08295) is available to reduce this effect. When it is installed on the front flange of the 10K-W or 15K-W, it will reduce the backscatter to about 0.9%, by absorbing much of the backscattered light and by reflecting some of it back into the sensor where that light is absorbed. The increased absorption with the shield causes the reading on the sensor to be slightly higher than without the shield. We have introduced a laser setting called NIRS to compensate for this. When using the scatter shield, set the laser setting to NIRS. Otherwise, leave it at NIR. The situation is similar for the 30K-W sensor; there the calibration is at 1070nm, and the settings are called “107” (for regular use) and “107S” (for use with the 30K-W Scatter Shield).

Fastest Calibration in the Industry

Why is Ophir-Spiricon's calibration lead-time the fastest in the industry? Learn about our lean journey and hear our announcement on how we will become even better this year.
05/25/15

Calibration Factors

When a power/energy meter is in "Calibrate" mode, various "Factors" are displayed to the user. This video explains the meaning of each of these factors.
06/24/14

Ophir Premium Energy Sensors – Even for UV

Meet Ophir’s high performance energy sensors for pulsed UV lasers (and not only for UV…). These sensors are the perfect solution for pulsed lasers at 193nm and 248nm. They offer -
10/20/20

BeamGage Laser Beam Profiling System

BeamGage® is a state-of-the-art beam profiling system that performs extensive data acquisition and analysis of laser beam parameters, including beam size, shape, and uniformity, and divergence. It...
02/16/17

How Can Accurate Laser Calibration Help Me?

Many people do not understand the necessity of equipment calibration. They do not understand what the calibration process entails, and how it can save them money, time, and frustration. Ophir&...
06/27/18

Fastest Calibration in the Industry

Why is Ophir-Spiricon's calibration lead-time the fastest in the industry? Learn about our lean journey and hear our announcement on how we will become even better this year.
06/02/15

White Paper: Measuring LED Power with Thermal Sensors

LED’s are used today in many applications with the most prominent being the lighting of our homes, streets and businesses. Despite their clear advantages, measurement techniques of the power, flux...
02/16/16

How Precisely Can You Measure Laser Power?

A measurement is only as good as its accuracy. Take height, for example. As a kid, you probably had yearly checkups at your doctor’s office. Among other things, he measured your height. Imagine, you’re 12 years old and you can’t wait to see if you’re finally five feet tall. So your doctor has you stand very straight and tells you that you’re 5 feet ± a foot
06/02/15

Laser Power Meter Usage in Law Enforcement

The Ophir Nova or Laserstar series power meters, along with the appropriate photodiode sensors are used on a daily basis for technical support and calibration of police
06/02/15

QBH Fiber Adapters for Measuring High Power Lasers

Fiber lasers have become the high power workhorse of the laser industry. With modular scalability and high efficiency, these lasers have become the tool of choice for many industrial processes.
11/24/21

Best of Laser Measurement 2021

With this Best of Laser Measurement 2021 blog post, we have collected the content that attracted the most interest from our community. Enjoy reading, viewing and listening!
12/29/21

Best of Laser Measurement 2020

With this Best of Laser Measurement 2020 blog post, we have collected the content that attracted the most interest from our community
12/21/20

How It Works: Measuring Laser Power with a Thermal Sensor

There are many ways to measure laser output: You can use a photodiode, thermopile, or pyroelectric sensor. This post will discuss how a thermopile is used to measure your laser (basics only) and what types of lasers it is suitable for.
06/03/20

Tech tip: Finding The Right Tool for the Right Job

Each week our team in Ophir Optronics Solutions Ltd. receives requests to replace older or damaged laser power or energy meters and sensors. At the same time, we receive many items returned to...
06/13/18

The Most Versatile Sensors for Very Low Power Lasers

The 3A family of laser power sensors is one of our most popular – and for good reason. You might already know the basic points: It’s very sensitive (down to 10 μW), yet comes with all the benefits of a thermal-based sensor: high damage threshold and spectrally flat across a very wide spectral range.
02/02/16

Wireless Laser Measurements: No Strings Attached

Remember how Pinocchio achieved his dream of becoming “real” when he was finally freed from his strings? If you need to measure your laser beam’s power or energy, but the usual...
11/01/17

Measuring irradiance of non-collimated light

In some applications laser or LED light is illuminating a certain area. In those applications it may be more practical to measure the irradiance or power density in [W/cm2] rather than...
11/28/19

How low can you measure laser power?

Ophir has very high standards for what is considered “measurable.”  That is why when we delineate a power scale, the minimum power is usually about 20...
06/02/15

A Photodiode Laser Sensor for Every Wavelength

If you are measuring very low powers, you’ll want a photodiode power sensor. These come in various models, with physically different detectors. Some are made from Silicon, some are Germanium, etc. ...
06/02/15

How to Measure Broadband Spectral Sources

Broadband spectral sources, such as arc lamps or gas-discharge lamps are still used in many lighting applications due to their high efficiency and other unique characteristics. ...
01/05/16

Q&A: M-Squared Laser Beam Quality

M2 takes a look at your beam caustic (the curve of the laser beam as it focuses and diverges again) and compares this to an ideal Gaussian beam caustic
10/27/15

What’s M-Squared, again?

Here’s a surprising statistic: Nine out of ten laser technicians have no idea what M² is. Most laser beam characteristics are easy to put your finger on:  laser beam width,...
04/25/18

Optical Power Measurement Solutions for Telecom Applications

Over 55 years ago, optical fiber was already contemplated as a more reliable alternative to copper wire in telecommunications. Optical cable can carry much more data than copper wire, is free of electromagnetic interference, and ensures less loss of a signal due to attenuation or noise.
06/09/21

A Beginner’s Guide to Laser Power Measurement

Power is the simplest way to gain an understanding of your laser, although it certainly doesn’t stop there. The only way to get a complete picture is to measure the profile of the laser as well
10/27/15

Need more help? Ask one of our experts! and we'll contact you as soon as possible
 

How Can Calibration Help Me?

For many people, it isn't clear why there is a need for calibration of measurement equipment. These laser users are not fully aware what the...
11/11/18

Calibration Wavelength

Calibration Method and Estimated Accuracy for Ophir High Power Sensors
Ophir models 5000W, 10K-W and Comet 10K are calibrated using relatively low power lasers ~ 150 - 300W. Using such low power lasers to calibrate the instrument vs. the high power at which the sensors are used raises the question of calibration accuracy. The following explanation clearly demonstrates that the 5000W, 10K-W and Comet 10K are indeed accurate to ±5% over their measurement range. The 5000W and 10K-W sensors work on the thermopile principle, where the radial heat flow in the absorber disk causes a temperature difference between the hot and cold junctions of the thermopile which in turn causes a voltage difference across the thermopile. Since the instrument is a thermopile voltage generating device, it must be linear at low values of output. Therefore, if it is shown to be linear at powers which are a significant fraction of the maximum power, it will necessarily be linear at very low powers and if the calibration is correct at low powers, it will remain correct at high powers as well. On the other hand, although the output may be linear at low powers, there may be a zero offset that, due to the relatively low output at low powers, will cause an error in calibration...
02/03/16

Calibration of Ophir L50(300)A-IPL sensor for use with gel coupled IPL sources

The Ophir L50(300)A-IPL energy sensor shown above when used in GEL mode is designed to measure the energy output of IPL type sources coupled to the patient's skin with optical index matching gel. The sensor has a large Ø65mm aperture with a glass window having an antireflection coating on its rear surface. The IPL source is placed on the window with gel coupling to eliminate the reflections of the top surface of the window. Since it is only a small distance on top of the absorber, even radiation a large angles reaches the absorbing coating. The sensor absorbing coating is of the LP2 type that has high absorbance, high damage threshold and low angular dependence.
04/25/18

Calibration Accuracy of Ophir’s High Power Sensors

An explanation of how we do this is provided below (A). In addition, a recent check of Ophir’s 5000W head by PTB in Germany shows excellent agreement between our calibration and their standards. The details of the correspondence between our sensor and their standard at powers up to 1400W is included here (B).

A. High Power Measurement Calibration Method and Estimated Accuracy of Models 5000W and 10K-W

06/29/14

Calibration Capability at Ophir

Calibration is perhaps the most important of our products. We have a complete line of calibration lasers so that we can always calibrate at or near the customer’s wavelength. These lasers include powers up to 400W and both CW and pulsed lasers. In addition, we have a number of heads calibrated at NIST used as calibration standards. Below is a list of the calibration wavelengths used at Ophir in calibrating our standard catalog heads. Usually the calibration is done at representative wavelengths within a band of wavelengths where the head is spectrally flat. The calibration then applies to any wavelength in this band. The specifications note the maximum additional error in each wavelength band due to variations incalibration between the wavelength of calibration and the wavelength of measurement.

05/19/14

What’s New: Calibration Portal

A quote attributed to Heraclitus, a Greek philosopher, states that change is the only constant in life. Change often comes as a surprise and is seen as a painful part...
03/06/16

How Can Calibration Help Me?

A common concern that I have heard throughout my years with Ophir-Spiricon is that many people do not understand the necessity of calibration. They do not understand...
01/13/16

Spectral Wavelength Calibration

All absorbers used in power/energy measurement are not entirely flat spectrally, that is, they vary in absorption with wavelength. For this reason...
11/06/17

Calibration of Ophir Terahertz Sensors

Terahertz (THz) applications - till recently mainly still in the R&D phase - are beginning to emerge into the light of the commercial and...
11/18/19
11/06/17

The calibration process insures that a sensor is working within in-tolerance performance, similar to “as new” condition. Typically when there is a damaged area on a power sensor disk, that particular area will exceed the disk uniformity specification, which is ±2% across the active surface area of the disk, and therefore (with a damaged area on a sensor) it will be rejected for calibration because it is outside of the acceptance criteria to pass the calibration procedure requirements.

When sending in a Power Meter for repair and/or re-calibration

Note the settings on your meter and sensor before sending the units in for calibration. To simplify the reintegration of your Ophir measurement instruments back into your system, please record your settings and parameters before sending your devices in for calibration.

During the calibration process occasionally we change the settings on an instrument back to the default. This means that when you receive the equipment back it will likely not start up as you had it. The end-user will see a change in how the meter and/or sensor are behaving. The difference could be as simple as changing the Average function, so the readings now appear less stable.

06/29/14
05/26/15

The Power Accuracy of +/-3% refers to the absolute uncertainty of the measured value. For example, for a 2 Watt reading, the actual "true" value would be between 1.94 W to 2.06 W (with reference to NIST, to which all our calibration is traceable). This assumes the reading is from about 5% of full scale up to full scale. It should be noted that our accuracy specification is in general based on 2 sigma standard deviation.

Repeatability of the measurement (assuming the laser itself is perfectly stable) is limited in the best case by the power noise level of the sensor, and is typically better than  +/- 1%  depending on the thermal stability of the environment. Stability at higher powers from the middle to the top of the range of the sensor head is usually better than the low end. This is due to small temperature variations having less of an effect as they are proportionally a lower percentage of the total power. For more information, refer to our Web tutorial at: https://www.ophiropt.com/laser-measurement-instruments/laser-power-energy-meters/tutorial/calibration-procedure

05/28/15

After numerous requests for re-calibration of M2 systems, in 2008 Ophir-Spiricon started a recalibration program for its M2 systems. This program allows the equipment to be sent back to the factory to be inspected, lubricated and re-calibrated. This enables customers to comply with their ISO regulations. Please click the below link to be directed to a section of our web site where you can request an RMA to return your equipment for re-calibration.
https://www.ophiropt.com/laser-measurement-instruments/customer-support/...

How Can Accurate Laser Calibration Help Me?

Many people do not understand the necessity of equipment calibration. They do not understand what the calibration process entails, and how it can save them money, time, and frustration. Ophir&...
06/27/18
05/26/15

The answer to this question is two-fold. First of all the recalibration process accomplishes the recalibration of the sensor and returns it to "as-new" working condition. If there is surface damage on the sensor disc that creates areas of non-uniformity exceeding the uniformity across-the-surface specification, then the disc needs to be replaced, even though the accuracy performance of the sensor is not out-of-tolerance. Secondly, many applications require that sensors be found in-tolerance during the calibration process, or else deviation explanations are required and/or costly recalls may need to be implemented. The calibration process is intended to help maintain the sensors within tolerance if at all possible.

05/26/15

All absorbers used in power/energy measurement are not entirely flat spectrally, that is, they vary in absorption with wavelength. For this reason, Ophir measuring sensors are usually calibrated at more than one wavelength. If the absorption changes only slightly with wavelength, then we define wavelength regions such as <800nm, >800nm and give a calibration within these regions. In that case, the error in measurement between the wavelength the device was calibrated for and the measurement wavelength is assumed to be within the primary wavelength calibration error.

Recalibration and Repair: Your Most Cost-Effective Calibration Solution

At Ophir-Spiricon, we realize that our customers are the lifeblood of our company. Because of this partnership, we are driven to provide quality products and services in the most cost-effective way possible. To help you minimize the costs of maintaining equipment, we have put into place many features of our services to support your goals.
02/01/16
11/15/20

The Pyrocam IIIHR and IV have a Certificate of Calibration for the detector recess distance and a Certificate of Camera Performance. See the attached examples.
 
We do certify the Pyrocam IIIHR and IV for operational performance against our internal standards that new equipment must meet and recommend annual re-certification for continued optimal performance. Because this is a Certificate of Camera Performance, it is up to the customer to decide if they want to send the camera back on an annual basis for re-certification. See our Knowledge Center article #9039 for more information. https://www.ophiropt.com/laser--measurement/knowledge-center/article/9039

03/21/17

The ModeCheck background calibration cycle may get stuck due to some environmental conditions which cause the wand position to become difficult to determine. You may be able to restore operation by cleaning the back side of the wand where the wand passes the optical sensor.

05/26/15

An explanation of how we can accurately calibrate at a fraction of the maximum power is given in our catalog introduction and on our website. In addition, in order to be sure of the calibration at higher powers, we have to know if the linearity of our sensors is within specification. For this purpose we have a 1500W sensor calibrated at various powers at a standards lab. Using a beam splitter and a 15,000 Watt laser we periodically check the linearity or our highest power sensors against this secondary standard.

Fastest Calibration in the Industry

Why is Ophir-Spiricon's calibration lead-time the fastest in the industry? Learn about our lean journey and hear our announcement on how we will become even better this year.
06/02/15

Fastest Calibration in the Industry

Why is Ophir-Spiricon's calibration lead-time the fastest in the industry? Learn about our lean journey and hear our announcement on how we will become even better this year.
05/25/15

Calibration Factors

When a power/energy meter is in "Calibrate" mode, various "Factors" are displayed to the user. This video explains the meaning of each of these factors.
06/24/14
06/09/14

All Ophir power meters, including photodiode power meters, have an air gap between the fiber tip and the sensor. Therefore they measure the power emitted by the fiber into the air and do not take into account any reflection losses there are in the fiber. Therefore, if in actual use, the fiber will be coupled with no loss to another element, then the losses should be added to the reading. These losses are usually about 4%. Thus if the reading on the Ophir meter is say 100mW, then in lossless use, the real power will be 104mW.

06/09/14

The Ophir integrating sphere sensors, models 3A-IS and 3A-IS-IRG have a white diffuse reflecting coating on the inside of the integrating sphere. The sensitivity of the sensor is quite sensitive to the reflectivity of the coating. If the coating absorption goes up 1%, it can cause a 5% change in reading. Therefore, care must be taken not to soil or damage the white coating of the sensors. Also it may be a good idea to send the sensors for recalibration yearly.

03/12/20

Customers often measure the same laser with 2 different Ophir sensors, both of which are specified to be within calibration. Let’s say that both of the sensors are specified to have a calibration uncertainty of ±3%. Do I expect the difference in reading between them to be less than 3%? On the first thought, this is what one might expect. However this is not necessarily so.
 
First of all, when we specify a calibration accuracy of ±3%, we are talking about a 2 sigma uncertainty, i.e. the readings of various sensors will be within a bell curve with 95% of all sensors reading within 3% of absolute correct calibration and 5% reading outside this accuracy. Thus there is a small chance that the meter will not be reading within 3% of absolute accuracy.
 
A more important reason is that the two sensors’ calibration error may be in two different directions and thus show a larger discrepancy between them than 3%. Say one sensor has been calibrated and reads 2.5% above absolute calibration and the other 2.5% lower than absolute calibration. Both of the sensors are within the specified ±3% absolute calibration but they will still read 5% differently from each other.
 
If we do statistical analysis, the analysis will show that there is in fact a probability of >16% that two correctly calibrated sensors will differ in reading from each other by more than 3% and a probability of over 6% that the sensors will differ in reading between each other by more than 4%.

White Paper: Measuring LED Power with Thermal Sensors

LED’s are used today in many applications with the most prominent being the lighting of our homes, streets and businesses. Despite their clear advantages, measurement techniques of the power, flux...
02/16/16

Laser Power Sensors introduction

As described in the general introduction, the thermopile sensor has a series of bimetallic junctions. A temperature difference between any two junctions causes a voltage to be formed between the two junctions. Since the junctions are in series and the «hot» junctions are always on the inner, hotter side, and the «cold» junctions are on the outer, cooler side, radial heat flow on the disc causes a voltage proportional to the power input. Laser power impinges on the center of the thermopile sensor disk (on the reverse side of the thermopile), flows radially and is cooled on the periphery. The array of thermocouples measures the temperature gradient, which is proportional to the incident or absorbed power. In principle, the reading is not dependent on the ambient temperature since only the temperature difference affects the voltage generated and the voltage difference depends only on the heat flow, not on the ambient temperature.

05/19/14

Bridging the THz Gap in Radiometry

The Renowned German standards laboratory Physikalisch-­‐Technische Bundesanstalt – PTB, has now developed a highly accurate calibration standard for calibrating Terahertz radiation based on a modified Ophir 3A-­‐P meter.

05/19/14
01/18/18

The starting point - the calibration measurements themselves (using the moderate-power lasers) - are all based on NIST-calibrated “master” sensors.
Basing high-power calibration accuracy on lower power calibration measurements is valid, subject to the condition that the sensors are linear all across the full power range.
A series of detailed tests have confirmed that indeed these sensors are highly linear, all the way up to the highest powers for which they are rated.
Since the thermal sensors have been shown to be linear over their entire range of powers, it follows that if the calibration is correct at low powers, it will remain correct at high powers as well.

06/03/15

The Ophir specification on accuracy is in general 2 sigma standard deviation. This means, for instance, that if we list the accuracy as +/-3%, this means that 95% of the sensors will be within this accuracy and 99% will be within +/-4%. For further information on accuracy see https://www.ophiropt.com/laser-measurement-instruments/laser-power-energy-meters/tutorial/calibration-procedure and https://www.ophiropt.com/laser--measurement/knowledge-center?search=calibration&=SEARCH

06/01/15

When using a camera with a lens, the operator must perform a spatial calibration to obtain accurate dimensional results. To do this, you must set up the camera lens system to view an object of a known dimension. The object to be viewed must contrast against its background to yield well defined edges. Use the following procedure.

  • In the Camera Dialog Box, set the "Pixel Scale" V value to 1.
  • In the Beam Display Toolbar Dialog Box check "Cursors" and "Crosshair"
  • In the Camera Dialog Box set the "Resolution" to 1X.
  • On the Beam Display Toolbar set "Crosshair" to Manual and "Cursor" to Manual.
  • Set the LBA into "CW Mode" and start it "Running."
  • Place an object containing at least one known dimension into the imaging plane of the camera lens system, and focus the optics. (A good object might be a circular disk with a diameter of 1cm.) The object should be large enough to fill over 50% of the display height. You can hardware zoom to enlarge the object if necessary. Orient the object so that the calibration dimension aligns vertically on the Y axis cursor. You can use the Pan and Cursor controls to achieve a good alignment.
  • With the mouse and left button move the cursor to one edge of the object
  • With the mouse and left button move the crosshair to the object's opposite edge. The Delta = value on the screen will contain the pixel count between the known calibration dimensions. Divide this number into the calibration dimension to yield the correct "Pixel Scale" value.
  • For example, if a 1cm distance produced a delta count of 176, then the "Pixel Scale" value would become .00568cm, or 56.8µm.

How Precisely Can You Measure Laser Power?

A measurement is only as good as its accuracy. Take height, for example. As a kid, you probably had yearly checkups at your doctor’s office. Among other things, he measured your height. Imagine, you’re 12 years old and you can’t wait to see if you’re finally five feet tall. So your doctor has you stand very straight and tells you that you’re 5 feet ± a foot
06/02/15

Raising the Standard of Service

At Ophir-Spiricon we have raised the standard of service. One of the pillars of our business model is customer satisfaction, and we firmly believe that the level of...
02/01/16

Expanded ISO Accreditations

At Ophir-Spiricon we pride ourselves on providing quality in every step of our service to you. To validate and measure our commitment to quality, Ophir-Spiricon has...
02/01/16

Can a Speeding Driver Avoid Paying a Fine by Claiming the Police LIDAR Meter was Incorrect?

Most drivers get caught speeding at some time during their driving experience. A common scenario occurs when a policeman uses a LIDAR speed meter to indicate that a car is over the speed limit. When the car is caught and pulled over, the driver shows a surprised, innocent face, attempting to get out of a fine. But when the policeman shows the driver the reading on his LIDAR speed meter he knows he’s going to have to pay. Can the driver claim that he was within the speed limit, claiming that the LIDAR instrument is not calibrated recently?

Various LIDAR instruments may be used to measure speed, direction of motion of a motor vehicle, and the distance to another moving vehicle. LIDAR instruments are used by the police to enforce speed limits and to analyze car crashes or crime scenes in order to reconstruct the scenes.

05/19/14
06/01/15

I would also like to set up a beam code to take 10 pictures once a day for 30 days, without human intervention.

Set your camera to capture at 30Hz if it has a frame format that supports 30Hz: 

Select an attached power meter or use the manual calibration tool if power calibration is required. If calibration is required counts will turn to an actual power reading for the total frame power or energy: 

You said you need an average so I will assume "Total" is the item you are averaging. It could be any results just enable the one(s) you need: 

You need to average 100 shots at 30Hz each hour so you will need to use the Burst Capture feature. The controls below (as currently set) will capture 100 frames every hour in results priority mode (what you need for this requirement). 

Provide a log file name here: 

Set frame averaging to 100 because you want to average the frames collected. This will produce results that are an average of 100 samples. 

Set logging to continuous as you will stop it manually after 30 days. 

You could also do the math (Days x Logs Per Day = Total logs or 30x24=720) and figure out how many samples a 30 day log would produce at this rate and place this number in the box below in place of the 1 you see now. Then click on the "Folder/Play-Button" icon to the right of the spin buttons to enable "Stop after X Logs" 

When you are ready to start logging, make sure the data source is running and click on the top middle icon you see here, which is the results logging button (has the 1.2 in the icon): 

When you are running and click the "Log Results" button the logging to disk will begin.

2D and 3D images (Pro release to introduce image logging) can also be logged by enabling the required image file types here: 

Use Excel to import the data from the log file with comma delimiting and you will see the following type of log: This log of total frame counts was made using burst capture of 100 frames every 5 seconds.

Tip: When you setup a log in this way you will only see the frames that are logged appear in the BeamGage beam displays. If you are logging one sample an hour you will not see a lot of activity in the beam display windows. Not to worry, you have the power of Multi-Clienting at your finger tips so you can minimize this instance of BeamGage and let it go on logging in the background (maximize it again when you want to see the last frames logged). Now, launch a new instance of BeamGage and connect to the same camera. Because the camera is set at 30Hz you will see a 30Hz video feed in the second instance of BeamGage. This will allow you to monitor in real-time while you are logging in slow-time.

Behold, the power of subscription rate when combined with logging and multi-clienting.

Laser Power Meter Usage in Law Enforcement

The Ophir Nova or Laserstar series power meters, along with the appropriate photodiode sensors are used on a daily basis for technical support and calibration of police
06/02/15

QBH Fiber Adapters for Measuring High Power Lasers

Fiber lasers have become the high power workhorse of the laser industry. With modular scalability and high efficiency, these lasers have become the tool of choice for many industrial processes.
11/24/21

Common Reasons for Photodiode Sensor Damage or Out of Tolerance Conditions

We have included this document with your recent calibration order because we have noticed an out of tolerance condition obtained from your equipment when returned for calibration. This document was created to assist our valued customers in the proper care and maintenance of Ophir photodiode sensors. The following information is for reference only. If you have any reason to believe that the sensor is no longer performing within the original specifications, we always recommend that you send it in for repair and/or recalibration by our trained technicians to bring the unit back to the proper NIST traceable standards.

Ophir photodiode sensors can be used for many years without any repairs when used with the proper laser optical setup. Many of our customers have sensors that are using their original absorber that are over ten years of age. We hope that this document will enable you to also enjoy the long life and reliable results that Ophir- Spiricon is known for.

05/19/14
02/14/21

Each Ophir sensor data sheet states its accuracy, typically something like ±3%. This refers to the absolute uncertainty of the measured value. For example, for a 2 Watt reading, the actual "true" value would be between 1.94 W to 2.06 W (with reference to NIST, to which all our calibration is traceable). To this must be added other uncertainties, if they exist. This assumes the reading is from about 5% of full scale up to full scale. It should be noted that our accuracy specification is, in general, based on a 2 sigma standard deviation.
 
This White Paper explains in detail exactly how we arrived at the accuracy numbers we specify, and what exactly they mean: Ophir Power/Energy Meter Calibration Procedure and Traceability/Error Analysis.

08/09/18

The short answer is…sort of.
There are 2 main issues that link measurement accuracy to beam diameter:

  • Uniformity of the sensor’s response across the aperture
  • Fraction of the sensor’s aperture that the beam fills

Because there is a tolerance on surface uniformity across any sensor’s aperture (there always is), beams of different sizes will of course be affected differently since they take up different chunks of the total surface. The actual uniformity spec varies from sensor to sensor. In general, the uniformity is better than +/-2% over the central 50% of the area (70% of the diameter), and for many sensors considerably better than this. For more information see our tutorial at https://www.ophiropt.com/laser-measurement-instruments/laser-power-energy-meters/tutorial/calibration-procedure.
 
Regarding the recommended portion of a sensor’s aperture that a beam should ideally fill: There is a balance here between several factors. All other things being equal, an ideal fraction of sensor aperture would be somewhere between 1/3 and 2/3. Please see this short video for a clear explanation.

05/02/16

On the Certificate of Calibration there is also listed the same “D” to indicate that the diffuser is installed for this wavelength calibration. If the diffuser cannot be removed, the wavelength remains the standard wavelength. An example would be: 532 for a 532 nm source.

05/26/15

With normal usage we recommend calibrating every 12 months. To accommodate shelf time and shipping time new manufactured product comes with a calibration sticker that shows a recalibration period of 18 months from manufacturing. However this does not negate the recommended 12 month recalibration interval should you receive the product with more than 12 months remaining on the new manufactured calibration sticker.

Longer Length Sensor Cables

The Ophir sensors are provided with a 1.5m cable between the sensor and the smart head connector. When a longer length cable is needed it can be provided, as long as it is within operational limits. However it is not possible to add an extension to the cable, because that moves the smart head connector away from the meter or interface unit which can degrade the smart head functionality or disable it.

06/29/14
06/09/14

The PD300 series of photodiode-based sensors are calibrated with a full spectral curve using a scanning monochromator (plus a few laser "anchor points").

 

The wavelength ("Laser") setting tells the meter what wavelength is being used and hence what calibration factor to apply when a measurement is underway. It does not, however, physically limit the possibility of other wavelengths from entering. All light (within the sensor's specified range of course) entering the detector will be measured; the meter will apply the calibration factor meant for the selected wavelength, "thinking" that only that wavelength is present.

 

In other words, these sensors assume a monochromatic light source. Their relative spectral response is not flat and they are therefore not suited for broadband beams.

 

So, if you want to check one wavelength from a broadband source, you will need to use a wavelength filter that only passes that wavelength. Then you should set your meter to the appropriate wavelength to account for the detector's relative sensitivity.

Effect of Ambient Conditions on Laser Measurements

We are often asked about the specified ranges of various ambient conditions (temperature, humidity, etc.) for Ophir instruments. In this article we will clarify the effects of these conditions on laser measurements, so you’ll be able to use your Ophir laser measurement instrument effectively.

06/29/14
02/14/21

If you can’t just arrange for a feedthrough of the cable through the chamber wall, then you’ll need to have panel-mounted connectors on the inside and outside of that wall; one cable segment connects from the sensor to the connector on the inside of the wall, and another cable segment continues from there to the meter. The trick is where/how to split the cable (you can see a short video about this question here. The starting point is that the D15 connector with the sensor’s EEPROM inside must be connected to the meter, and any split will be elsewhere along the cable. From there, for power sensors the simplest solution is to cut the sensor cable between the D15 smart plug and the sensor itself. There are only 2 internal wires and a screen/shield to connect, and the panel-mounted connectors will be simpler. (If you need to do this on multiple sensors, you’ll need to be careful to keep each sensor paired with its own D15 plug, as the EEPROM in the D15 plug is where the individual sensor’s calibration data is stored.)
 
More generally, such as for other sensor types, the usual way to approach this would be to use a “split cable” solution, where there would be a panel-mounted D15-to-D15 feedthrough connector on the vacuum chamber panel (the 2 D15 connectors would be “dumb”, i.e. without the EEPROM inside that holds the calibration data – their purpose would be just to feed-through), and from the outer connector there would be a second segment of cable terminating in a “Smart” D15 connector that connects to the meter. Consult with Ophir if this is of interest for you.

The Telescope Array Project

By Stan Thomas, University of Utah – Physics Department Thomas@physics.utah.eduThe Telescope Array...
05/31/15
01/13/16

The old pyro sensors and the newer PE-C sensors are almost identical; the differences between them are as follows:

  1. More compact
  2. User Threshold – minimum energy threshold (below which the sensor will not trigger) can be selected according to users' needs
  3. Measures longer pulses (up to 20ms depending on model)
  4. Has up to 5 pulse width settings as opposed to only 2 pulse width settings

Disadvantages:
Smaller size and therefore:

  • May need a heat sink (P/N 7Z08267) in order to stand up to higher average powers
  • May need a mechanical size adapter (P/N 7Z08273) if it must fit into an existing mechanical jig designed for the older models

Meters and Software Support:
StarLite, Juno, Vega, & Nova II fully support the Pyro-C series. Laserstar, Pulsar, USBI, Quasar, and Nova / Orion with adapter* partially support the Pyro-C series:

  • Only 2 of the 5 pulse width settings are available
  • Lowest measureable energy cannot be selected (no User Threshold).

StarLab software supports both Pyro-C and older pyro series.

*Note: The PE-C series will only operate with Nova / Orion meters with an additional adapter Ophir P/N 7Z08272 (see details in Ophir website).

Wavelength Setting Names:
If you have your own software for communicating with the sensor, it may be important to note that for some models, the names of the wavelength settings are a bit different between the old pyro and the new PE-C, even though they mean exactly the same thing.

For example, with diffuser OUT, the settings in the PE50BB-DIF-V2 are called “<.8u” (i.e. visible, represented by a calibration point at 532nm that covers the full visible range), and “106” (i.e. 1064nm), while in the PE50BB-DIF-C these same settings are called “532” (i.e. 532nm, the calibration point for the visible) and “1064”.

Ophir-Spiricon Laser Measurement in Medical Laser Service

The global medical industry incorporates thousands of lasers into its arsenal of treatment tools. Wavelengths from UV to Far-infrared are used for everything from Lasik eye surgery to cosmetic skin resurfacing. Visible wavelengths are used in dermatology and ophthalmology to target selective complementary color chromophores. Laser powers and energies are delivered through a wide range of fiber diameters, articulated arms, focusing handpieces, scanners, micromanipulators and more.

06/29/14

Laser Power / Energy Measurement Today

The laser industry is advancing steadily with new wavelengths, higher powers and energies, and new applications all the time. As the power, energy and variety of new lasers advances, so measurement of these lasers has to advance.

05/19/14
05/08/17

Our recalibration process is to not automatically upgrade the firmware in meters when they are sent in for recalibration, unless specifically requested to upgrade it. The reason for this is that we support many companies, such as medical companies, that have equipment validation processes that don’t allow changing the firmware version from the currently validated version. If you do want the latest firmware version installed, we will do that at no additional charge (for meters which are upgraded electronically) if it is specifically requested on the RMA request checklist form. For older meters (such as the Nova) that are upgraded through changing the EEPROM, a nominal fee is added, if firmware upgrade is requested. Note; upgrading the firmware does not affect the calibration.

04/26/22

This is one of our most-often-asked questions (we don’t call these FAQ's for nothing…). In general terms: There are a few factors that contribute to the final overall uncertainty in your measurement. For the sensor, these include, among others (and these are all mentioned in the sensor's datasheet):

  • The "basic" specified measurement accuracy (a typical value might be +/- 3%)
  • Additional uncertainty for wavelengths in the specified range that are not actual calibration points (this and those that follow are specified in the datasheet as "up to…x%" or similar)
  • Linearity
  • Additional error with frequency (for energy sensors)
  • Uniformity across the aperture surface

Then it starts getting complicated… Some of these numbers would get combined statistically, as root-of-sum-of-squares. Basically, that happens when the errors are random (so one factor might in one case introduce some error in the high direction, but another factor might at the same time be introducing an error in the low direction). However, if you are for example working right near the top of a given energy range, or right near the maximum frequency specified for the sensor, then the additional error being introduced is not random at all; in such cases the numbers would have to be added arithmetically. For example, to give this some meaning:
Say you are working at <70% of the maximum energy of the range and <70% of the maximum pulse rate. In that case, the linearity and frequency-dependent errors can be assumed to be random. If the beam is, say, around 1/4 of the aperture and is centered, the uniformity error can be ignored (that's how we set it up when we calibrate the sensor, so by working in similar conditions you've eliminated some variables). In that case you may use statistical combination of errors to compute the expected total error. For instance if the stated "basic" measurement accuracy is ±3%, the stated linearity is ±1%, and the stated pulse rate dependence is ±1%, then the 2 sigma total error can be taken to be √ [(0.03)² + (0.01)² + (0.01)²] = 3.3% - only slightly higher than the "basic" 3%. If, on the other hand, the pulse rate or power approaches the maximum permitted, then you must take the maximum value as the expected total error, i.e. 0.03 + 0.01 + 0.01 = 5% in the above example. Just to add: Since the meter error is so low (typical electrical accuracy is specified as +/-0.25% new and +/-0.5% after a year), it can be ignored in most cases. You can find more in-depth information in this article and in this On-Demand Webinar.

Best of Laser Measurement 2021

With this Best of Laser Measurement 2021 blog post, we have collected the content that attracted the most interest from our community. Enjoy reading, viewing and listening!
12/29/21

Best of Laser Measurement 2020

With this Best of Laser Measurement 2020 blog post, we have collected the content that attracted the most interest from our community
12/21/20

Ophir Premium Energy Sensors – Even for UV

Meet Ophir’s high performance energy sensors for pulsed UV lasers (and not only for UV…). These sensors are the perfect solution for pulsed lasers at 193nm and 248nm. They offer -
10/20/20

How It Works: Measuring Laser Power with a Thermal Sensor

There are many ways to measure laser output: You can use a photodiode, thermopile, or pyroelectric sensor. This post will discuss how a thermopile is used to measure your laser (basics only) and what types of lasers it is suitable for.
06/03/20
04/11/19

The spectral range stated at the beginning of the spec indicates the range of wavelengths for which the sensor can be usefully used even if the exact calibration is not specified for that range. This means that over the calibrated wavelength range, the accuracy is specified and guaranteed. Over a wider useful wavelength range, the sensor is usable but no accuracy is guaranteed. In general over this wider range, the accuracy will be within up to ±15%.

03/26/19

The spectral range stated at the beginning of the spec indicates the range of wavelengths for which the sensor can be usefully used even if the exact calibration is not specified for that range. This means that over the calibrated wavelength range, the accuracy is specified and guaranteed. Over a wider useful wavelength range, the sensor is usable but no accuracy is guaranteed. In general over this wider range, the accuracy will be within up to ±15%.

Tech tip: Finding The Right Tool for the Right Job

Each week our team in Ophir Optronics Solutions Ltd. receives requests to replace older or damaged laser power or energy meters and sensors. At the same time, we receive many items returned to...
06/13/18
11/06/17

StarLab 3.50 does include new features which may require a firmware upgrade of the meter or PC interface, I.E. Juno, in order to operate with it. The required firmware is included with StarLab 3.50, but you do need to click on the More… link in the Select Device(s) menu in order to launch the Diagnostics menu and then proceed with the Upgrade firmware procedure. After performing the firmware upgrade, the meter or PC interface will connect with StarLab and operate normally. Note; Upgrading the firmware will not affect calibration.

09/14/17

The analog output of the meter - using the mating connector provided – gives a voltage signal proportional to the actual reading (it is in fact just a D/A translation of what is being displayed), so it represents a fully calibrated reading. The full scale value is a function of the meter being used and the power range it is on. With the StarBright, Vega and Nova II, for example, the user can select full scale analog output voltage ranges of 1v, 2v, 5v or 10v, and the 100% level of the chosen power scale is scaled to the full scale voltage. For example: if you choose 5V full scale analog voltage range, and your sensor is set to a 50W full scale power range, then you will have 5V = 50W or 0.1 V/W. It will vary according to the chosen power range and chosen full scale voltage range. The electrical accuracy is stated in the specification (see the User manual) as ±0.2% (of reading) ±0.3% of full scale volts (in addition to the calibration accuracy of the sensor’s reading itself).

03/21/17

Because of the design of the lenses for the new BeamSquared, you will be able to use lenses on multiple systems. We have included an RFID chip on each lens which holds the information for that lens. We have also programmed the BeamSquared optical trains to have their calibration information stored in the device. With this improvement the configuration files for pairing optical trains and lenses are no longer required making lenses interchangable.

03/14/17

An unused port should be closed, to prevent unwanted light from entering the sphere. Closing it with a diffuse white port plug, however, adds the surface area of that plug to the (diffuse white) effective area of the sphere that is doing the “integrating”. For a calibrated integrating sphere sensor, this change in the behavior of the sphere changes its calibration, and results in incorrect readings. In such applications, a black “Port Cover” should be used.

BeamGage Laser Beam Profiling System

BeamGage® is a state-of-the-art beam profiling system that performs extensive data acquisition and analysis of laser beam parameters, including beam size, shape, and uniformity, and divergence. It...
02/16/17
07/25/16

It is NOT recommended to interchange the lenses between units. The M2-200s lenses are unique and serialized for the particular M2-200s unit they are provided with. Each lens includes calibration information for the Effective Focal Length and Back Focal Length that are entered into the specific serialized configuration files for each M2-200s. If lenses are interchanged between units, accuracy can be degraded. If lenses are lost or broken, we can replace them. If specific configuration files are lost, we do keep backup copies of them and can email them to you.

The Most Versatile Sensors for Very Low Power Lasers

The 3A family of laser power sensors is one of our most popular – and for good reason. You might already know the basic points: It’s very sensitive (down to 10 μW), yet comes with all the benefits of a thermal-based sensor: high damage threshold and spectrally flat across a very wide spectral range.
02/02/16
06/15/15

With Ophir's Smart Head technology sensors can be interchanged between different meters easily. The calibration and setting information is stored in the sensors Smart Head connector so it moves with the sensor to the new meter. It is recommended that you power off your Nova meter before removing the sensor, but the new Nova II and Vega meters detect that a sensor has been removed or attached and will power cycle themselves when doing this.

06/03/15

Ophir meters and sensors are calibrated independently. Each meter has the same sensitivity as the other within about 2 tenths of a percent. Each sensor is calibrated independently of a particular meter with its calibration information contained in the DB15 plug. When the sensor is connected to the meter, the meter reads and interprets this information. Since the accuracy of our sensors is typically +/-3%, the extra 0.2% error that could come from plugging into a different meter is negligible and therefore it does not matter which calibrated meter we use with a particular calibrated sensor.

05/28/15
With the addition of optics, the largest laser beam you can measure is limited by the amount of reduction afforded by the optical setup.  With the use of supporting equipment such as beam reducers or CCTV lenses a spatial calibration can be performed, giving the equivalent pixel pitch with the lenses in place.  Sometimes an imaging target may be needed to make sure you are focusing the imaging optics to the correct location. 
 
In most applications the beam size is less than 10mm. When a beam gets larger, a reducing telescope can be used to bring it down to a size to fit on the array. Our largest array camera, the L11059, has an array size of 26x39mm.
05/27/15

The Quasar is no different than the other instruments that have electronic components: it requires annual recalibration. But it’s up to the customer whether to do this or not. We know that the calibration of the instruments degrades somewhat over time, as shown in the datasheet. This may or may not affect your particular application. To maintain compliance with ISO and other standards, we highly encourage annual recalibration.

05/26/15

Generally, our sensors are calibrated (traceable to NIST) to within ±3% accuracy 2 sigma which means that 95% of the sensors are accurate within ±3%. However, if your application requires very high accuracy, we also offer something called “double calibration” which can bring the error down to ±2%.

05/21/15

Select the range that contains your wavelength. The sensors have coatings on them that have been characterized and for any wavelength within that range the sensor will be within calibration tolderance including variations in sensitivity within that range. When there is a difference in sensitivity that exceeds the allowable tolerances, a new wavelength range is created and a calibrated for.

06/23/14

There are a number of options, depending on the purpose.

  • In many cases, the simplest solution could be to make use of the analog output of the meter – that gives a voltage signal proportional to the actual reading (it is in fact just a D/A translation of what is being displayed), so it represents a fully calibrated reading. The full scale value is a function of the meter being used and the power range it is on.
  • The "SH to BNC connector" (Ophir P/N 7Z11010) simply takes the raw output from the detector element and sends it to the scope. It bypasses the sensor's EEROM which contains the calibration data, so it essentially turns the sensor into an uncalibrated "dumb" analog sensor. It should be noted, though, that in some cases we could be talking about a signal to the scope that may be low, perhaps even near the noise level of the scope, which limits the usefulness of this method at low powers.
  • If the need is to see the pulse width – the temporal profile – the solution (assuming applicable specs) is to use an approprinte temporal sensor connected to a scope; you can point it anywhere where it will catch some backscatter from your laser, and you'll see the pulse temporal form as it really is.
06/09/14

For HE between 0.625 and 1um, the window transmits too much and the absorption drops by ~10%. Because of this, the thermal heat sink compound behind the absorber can dry out. If the power and energy is kept to 1/10 of maximum and the calibration is not important, the sensor can be used in this spectral region.

06/09/14

First, clean the absorber surface with a tissue, using Umicore #2 Substrate Cleaner, acetone or methanol. Then dry the surface with another tissue. Please note that a few absorbers (Pyro-BB, 10K-W, 15K-W, 16K-W and 30K-W) cannot be cleaned with this method. Instead, simply blow off the dust with clean air or nitrogen. Don't touch these absorbers. Also, HE sensors (such as the 30(150)A-HE-17) should not be cleaned with acetone.
 
Note: These suggestions are made without guarantee. The cleaning process may result in scratching or staining of the surface in some cases and may also change the calibration.

05/26/15

How long you fire the laser into the meter depends on you. Some manufacturers do it 100% of the time via a beam splitter. That way they have a constant feedback system to allow them to not only monitor the power output, but also to control it so the laser is stable. Other people only do it for a short time to verify the setting is producing the correct amount of power. For different applications different sensors would be needed. For continual monitoring we would recommend a sensor that is designed to have the laser on it all the time. For short time measurements, a sensor designed for short use would be more ideal. For lasers that are pulsed, we recommend firing the laser a couple of times to get an understanding of the pulse to pulse change as well as being able to monitor the average. However, some applications only want to verify the energy setting, so they only fire the laser once to see if they are ready to go. Again, the decision is up to you. Processing the information in the PLC is completely up to you. Usually this requires some form of calibration so you can take the information you are delivering to the PLC and correlate it with your operator display. I.e. Volts/Watt. How many Volts from the sensor is equal to X amount of Watts the laser just produced.

Wireless Laser Measurements: No Strings Attached

Remember how Pinocchio achieved his dream of becoming “real” when he was finally freed from his strings? If you need to measure your laser beam’s power or energy, but the usual...
11/01/17

Measuring irradiance of non-collimated light

In some applications laser or LED light is illuminating a certain area. In those applications it may be more practical to measure the irradiance or power density in [W/cm2] rather than...
11/28/19

Reimaging UV Laser Beam Profiling

Ophir Photonics offers a number of solutions for profiling UV laser beams. Spot sizes from 0.15mm to over 25mm can be safely profiled without the risk of camera sensor...
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03/18/18

The 10K-W and 15K-W sensors are calibrated at wavelength 1.064μm, but since they relatively flat spectrally throughout the near infrared, this setting can be use anywhere in the spectral range 0.8 – 2μm. This is represented by the wavelength setting “NIR”. (They are also calibrated at 10.6um for CO2 lasers.)

 
Approximately 3.2% of the light impinging on the sensor is backscattered in a diffuse manner. The “Ophir 10K-W/15K-W Scatter Shield” (P/N 7Z08295) is available to reduce this effect. When it is installed on the front flange of the 10K-W or 15K-W, it will reduce the backscatter to about 0.9%, by absorbing much of the backscattered light and by reflecting some of it back into the sensor where that light is absorbed. The increased absorption with the shield causes the reading on the sensor to be slightly higher than without the shield. We have introduced a laser setting called NIRS to compensate for this. When using the scatter shield, set the laser setting to NIRS. Otherwise, leave it at NIR. The situation is similar for the 30K-W sensor; there the calibration is at 1070nm, and the settings are called “107” (for regular use) and “107S” (for use with the 30K-W Scatter Shield).

VCSEL Measurement Solutions

Vertical Cavity Surface Emitting Lasers (VCSELs) are a type of semiconductor laser diode. Unlike edge emitting laser diodes, VCSELs emit upwards and thus can be easily packaged as emitter arrays containing hundreds of emitters on a single chip.
01/21/19

How low can you measure laser power?

Ophir has very high standards for what is considered “measurable.”  That is why when we delineate a power scale, the minimum power is usually about 20...
06/02/15

A Photodiode Laser Sensor for Every Wavelength

If you are measuring very low powers, you’ll want a photodiode power sensor. These come in various models, with physically different detectors. Some are made from Silicon, some are Germanium, etc. ...
06/02/15

How to Measure Broadband Spectral Sources

Broadband spectral sources, such as arc lamps or gas-discharge lamps are still used in many lighting applications due to their high efficiency and other unique characteristics. ...
01/05/16

Q&A: M-Squared Laser Beam Quality

M2 takes a look at your beam caustic (the curve of the laser beam as it focuses and diverges again) and compares this to an ideal Gaussian beam caustic
10/27/15

What’s M-Squared, again?

Here’s a surprising statistic: Nine out of ten laser technicians have no idea what M² is. Most laser beam characteristics are easy to put your finger on:  laser beam width,...
04/25/18

Optical Power Measurement Solutions for Telecom Applications

Over 55 years ago, optical fiber was already contemplated as a more reliable alternative to copper wire in telecommunications. Optical cable can carry much more data than copper wire, is free of electromagnetic interference, and ensures less loss of a signal due to attenuation or noise.
06/09/21

A Beginner’s Guide to Laser Power Measurement

Power is the simplest way to gain an understanding of your laser, although it certainly doesn’t stop there. The only way to get a complete picture is to measure the profile of the laser as well
10/27/15