FPS-1

7Z02505
Description: 

The FPS-1 is a fast optical detector for visualizing and measuring the temporal characteristics of laser beams in the spectral range from 193 nm to 1100 nm. It has a UV enhanced silicon PIN photodiode and is designed to convert optical signals into electrical signals which are then measured with third party measurement instrumentation such as oscilloscopes or spectrum analyzers for measurement. The FPS-1 has a rise time of 1.5 nsec. Its reverse bias voltage is provided either by internal batteries or by an external DC power supply (included).

Specification

  • UV-Si
  • 1.5 nsec
  • 193-1100 nm
  • 1.02 mm
  • 0.05 pW/√Hz
  • 49 L x 61 W x 27 D (mm)
  • 0.8 mm²
  • 720 nm
  • 0.45 A/W
  • 0.18 V/(W/cm²)
  • 12 VDC
  • External or Batteries
  • 233 MHz
  • 0.3nA typ, 1.0nA max
  • 3 mW
  • 1/4-20
  • BNC
  • SM-1
  • CE, China RoHS
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FAQ

Do I need to recalibrate my instrument?

Ophir's temporal sensors do not require calibration.

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What kind of measurements can I do with a temporal detector? Why are they important?

With a temporal detector you can measure the rise time, fall time, pulse duration and pulse frequency. Many laser applications use pulsed laser, for example medical lasers, LIDARs, and high power fiber laser for metal processing to name a few. The parameters of the laser pulses are critical for the performance of the application.

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The temporal sensor can provide accurate measurement of temporal parameters. How can I relate those to absolute value of pulse energy?

Pulse energy can be measured directly using one of Ophir's calibrated energy sensors. Another way is to use a calibrated power sensor and calculate the pulse energy using:

Pulse energy [J] = average power [W] / pulse rate [pulses per second]

Temporal sensors provide a signal that is proportional to the instantaneous power output of the laser. When viewing the pulse waveform on an oscilloscope, the integrated area under the curve is proportional to the total pulse energy.

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What is the difference between the calibrated power sensors such as PD300 and the temporal sensors?

calibrated power sensor measures average power of CW and pulse laser beams. The sensor is connected to an Ophir Meter or PC Interface. Power sensors are optimized for low noise and linear response in order to maximize power measurement accuracy. The measured laser beam must be smaller than the sensor's aperture in order to obtain an accurate power measurement. Temporal sensors are optimized for high speed response in order to reproduce pulse temporal characteristics with high fidelity. A temporal sensor is usually smaller than the laser beam size and samples a portion of the beam. The temporal sensor is connected to a scope or spectrum analyzer to display temporal characteristics of pulsed lasers.

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I need to measure the temporal pulse shape of a very powerful laser. How can I do that without damaging the detector?

There are several possible ways to do this:

  • Use a beam sampling optic (partially reflective mirror or uncoated window).
  • Feed the laser beam into an integrating sphere and attach the temporal detector to the sphere using the adapter accessory.
  • Use a beam dump and position the detector such that it picks up some of the reflected laser radiation.

Attenuating accessories are available (see temporal detector's product page). Laser power density on the attenuators should be less than 50 W/cm².

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I don’t see my signal on the oscilloscope or the signal is not as expected. What should I do?

See the troubleshooting section of the user manual in the temporal detector's product page for detailed information.

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I sometimes need to see an analog representation of my laser power on a scope, in parallel to measuring it with a thermal sensor. What solutions are available?

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.
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Calibration

Ophir's temporal sensors do not require calibration.

Videos

Pulse Characterization Sensors Pulse Characterization Sensors

Using these Ophir fast photodetectors, you can see and measure the temporal characteristics of pulsed and CW laser beams.

Accessories

Customers that purchase the above items also consider the following items. Ophir-Spiricon meters and sensors include a standard manufacturers warranty for one year. Add a one year Extended Warranty to your meter or sensor, which includes one recalibration.
  • 1" integrating sphere port to SM-1 thread adapter for mounting the FPS-1 on IS6 integrating spheres.

  • FC Fiber Adapter

    FC Fiber Adapter

    7Z08229
    This fiber adapter is used for connecting power and energy sensors to a standard FC-type fiber. Many sensors need an additional mounting bracket to connect to all fiber adapters. More information can be found in the datasheet below.
  • ST Fiber Adapter

    7Z08226
    This fiber adapter is used for connecting power and energy sensors to a standard ST-type fiber. Many sensors need an additional mounting bracket to connect to all fiber adapters. More information can be found in the datasheet below.
  • SC Fiber Adapter

    SC Fiber Adapter

    7Z08227
    This fiber adapter is used for connecting power and energy sensors to a standard SC-type fiber. Many sensors need an additional mounting bracket to connect to all fiber adapters. More information can be found in the datasheet below.
  • SMA Fiber Adapter

    SMA Fiber Adapter

    1G01236A
    This fiber adapter is used for connecting power and energy sensors to a standard SMA-type fiber. Many sensors need an additional mounting bracket to connect to all fiber adapters. More information can be found in the datasheet below.
  • PD300R/FPS-1 Fiber Adapter Bracket
    A mounting bracket is needed to connect round photodiode sensors to a fiber adapter (SC, ST, FC or SMA). This bracket can be used for the PD300R (round) photodiode series, as well as the FPS-1 fast photodiode. It is not needed for the PD300-IRG sensor. This bracket is also used for mounting ND attenuators on the FPS-1.