3A-P-THZ

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概览

3A-P-THz是一款高灵敏度热功率/能量激光测量传感器，针对太赫兹波长进行标定。具有12mm孔径。功率测量范围为15µW - 3W，能量测量范围为20µJ - 2J。该传感器针对0.3THz - 10THz的光谱范围进行了标定。该传感器配备一根1.5米电缆，用于连接至一个主机仪表或PC接口。

P type high sensitivity 0.1 to 30 THz absorber
15 µW to 3 W power measurement range
20 µJ to 2 J energy measurement range
Very low noise and drift
Fiber optic adapters available

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制品

		对比	型号	兼容性	排序订单	排行得分	ranking	图纸、CAD和参数		吸收器类型	孔径尺寸	最小功率	最大平均功率	库存	指定物品	价格		牌
		7Z02742 3A-P-THz Thermal Laser Power Sensor, P Type, 15 µW to 3 W, Ø12 mm, 0.1-30 THz $1,343 有现货	7Z02742 3A-P-THz Thermal Laser Power Sensor, P Type, 15 µW to 3 W, Ø12 mm, 0.1-30 THz	UNIVERSAL	0.0	1.0	0.0		0.0	P - Short pulse	Ø12 mm	15 µW	3 W	有现货		$1,343		Ophir

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产品规格

产品名称

3A-P-THz
吸收器类型

P - Short pulse
孔径尺寸

Ø12 mm
光谱范围

0.1-30 THz
最小功率

15 µW
最大平均功率

3 W
最小脉冲能量

20 µJ
最大脉冲能量

2 J
响应时间

2.5 s

最大平均功率密度

0.05 kW/cm²
最大能量密度 <100 ns

1 J/cm²
最大能量密度 2ms

1 J/cm²
冷却

Convection
尺寸

Ø70 x 30 mm
电缆长度

1.5 m
CE 符合性

Yes
UKCA 符合性

Yes
中国 RoHS 符合性

Yes

特征

How to Measure Power of TeraHertz Beams

THz radiation is being talked about more and more lately, because of its unique usefulness in a wide range of applications. In this video you will learn about some of these applications, and about a range of solutions Ophir offers for measuring THz beams.

Choosing a Thermal Sensor

In this short “Basics” video we review the use – and selection - of thermal sensors for measuring low, medium and high laser powers.

Thermal Power Sensor Accuracy

Ophir former CTO Dr. Ephraim Greenfield discusses the various factors that contribute to uncertainties in measurement when using Ophir laser power and energy meters.

Sensors for Measuring Laser Power

In this short "Basics" video we review in general how one goes about measuring laser beam power, so that you'll have a clear understanding of what the different sensor types are, and when to use each type.

Thermal Sensor Calibration

As the spectral sensitivity of the absorber used for the power and energy measurement is not fully linear, Ophir sensors get a high precision calibration by default with more than one wavelength.

Each thermal sensor is calibrated independently of a particular Ophir power 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 to display a calibrated reading. Each power meter is calibrated independently and has the same sensitivity as an other meter within about 2 tenths of a percent.

Unless otherwise indicated, Ophir sensors and meters should be recalibrated within 18 months after initial purchase, and then once a year after that.

Absorption of different thermal sensor absorber types

常见问题

Must I use a particular sensor only with the meter it was ordered with?
回答
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.

How should I clean my sensor?
回答
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.

When an accuracy spec is given, what exactly is meant?
回答
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 calibration procedure tutorial.

How do you calculate the power and energy density of a laser beam?
回答
If the power is P and the diameter of the beam is D then the power density is P /(.785 * D²) . If it is a pulsed laser and the energy is E, the repetition rate is R and the diameter is D then the power density is E*R/(.785 * D²), The energy density is E/(.785 * D²). The sensor finder will automatically calculate the power and energy density.

Does the damage threshold depend on power level?
回答
The damage threshold of thermal sensors does depend on the power level and not only the power density because the sensor disc itself gets hotter at high powers. For instance, the damage threshold of the Ophir broadband coating may be 50KW/cm2 at 10 Watts but only 10KW/cm2 at 300W. The Ophir specifications for damage threshold are always given for the highest power of use of a particular sensor, something which is not done by most other manufacturers. This should be taken into account when comparing specifications. The Sensor Finder takes the power level into consideration when calculating damage threshold.

If according to the catalog specs or the sensor finder I am very close to the damage threshold but below it, should I choose such a sensor?
回答
It is not recommended to choose a sensor if it is very close to the damage threshold if there is an alternative, since laser damage is not an exact figure and depends on many things. Use the Sensor Finder to find the best match where you are preferably below 50% of the damage threshold.

Do I need to recalibrate my instrument? How often must it be recalibrated?
回答
Unless otherwise indicated, Ophir sensors and meters should be recalibrated within 18 months after initial purchase, and then once a year after that.

Can a laser measurement depend on the distance from the laser to the sensor?
回答
In theory, if a beam is completely parallel and fits within the aperture of a sensor, then it should make no difference at all what the distance is. It will be the same number of photons (ignoring absorption by the air, which is negligible except in the UV below 250nm). If, nevertheless, you do see such a distance dependence, there could be one of the following effects happening:
- If you are using a thermal type power sensor, you might actually be measuring heat from the laser itself. When very close to the laser, the thermal sensor might be “feeling” the laser’s own heat. That would not, however, continue to have an effect at more than a few cm distance unless the light source is weak and the heat source is strong.
- Beam geometry – The beam may not be parallel and may be diverging. Often, the lower intensity wings of the beam have greater divergence rate than the main portion of the beam. These may be missing the sensor's aperture as the distance increases. To check that you'd need to use a profiler, or perhaps a BeamTrack PPS (Power/Position/Size) sensor.
- If you are measuring pulse energies with a diffuser-based pyroelectric sensor: Some users find that when they start with the sensor right up close to the laser and move it away, the readings drop sharply (typically by some 6%) over the first few cm. This is likely caused by multiple reflections between the diffuser and the laser device, which at the closest distance might be causing an incorrectly high reading. You should back off from the source by at least some 5cm, more if the beam is not too divergent.
Needless to say, it’s also important to be sure to have a steady setup. A sensor held by hand could easily be moved around involuntarily, which could cause partial or complete missing of the sensor’s aperture at increasing distance, particularly for an invisible beam.

常见问题

Must I use a particular sensor only with the meter it was ordered with?
回答
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.

How should I clean my sensor?
回答
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.

When an accuracy spec is given, what exactly is meant?
回答
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 calibration procedure tutorial.

How do you calculate the power and energy density of a laser beam?
回答
If the power is P and the diameter of the beam is D then the power density is P /(.785 * D²) . If it is a pulsed laser and the energy is E, the repetition rate is R and the diameter is D then the power density is E*R/(.785 * D²), The energy density is E/(.785 * D²). The sensor finder will automatically calculate the power and energy density.

Does the damage threshold depend on power level?
回答
The damage threshold of thermal sensors does depend on the power level and not only the power density because the sensor disc itself gets hotter at high powers. For instance, the damage threshold of the Ophir broadband coating may be 50KW/cm2 at 10 Watts but only 10KW/cm2 at 300W. The Ophir specifications for damage threshold are always given for the highest power of use of a particular sensor, something which is not done by most other manufacturers. This should be taken into account when comparing specifications. The Sensor Finder takes the power level into consideration when calculating damage threshold.

If according to the catalog specs or the sensor finder I am very close to the damage threshold but below it, should I choose such a sensor?
回答
It is not recommended to choose a sensor if it is very close to the damage threshold if there is an alternative, since laser damage is not an exact figure and depends on many things. Use the Sensor Finder to find the best match where you are preferably below 50% of the damage threshold.

Do I need to recalibrate my instrument? How often must it be recalibrated?
回答
Unless otherwise indicated, Ophir sensors and meters should be recalibrated within 18 months after initial purchase, and then once a year after that.

Can a laser measurement depend on the distance from the laser to the sensor?
回答
In theory, if a beam is completely parallel and fits within the aperture of a sensor, then it should make no difference at all what the distance is. It will be the same number of photons (ignoring absorption by the air, which is negligible except in the UV below 250nm). If, nevertheless, you do see such a distance dependence, there could be one of the following effects happening:
- If you are using a thermal type power sensor, you might actually be measuring heat from the laser itself. When very close to the laser, the thermal sensor might be “feeling” the laser’s own heat. That would not, however, continue to have an effect at more than a few cm distance unless the light source is weak and the heat source is strong.
- Beam geometry – The beam may not be parallel and may be diverging. Often, the lower intensity wings of the beam have greater divergence rate than the main portion of the beam. These may be missing the sensor's aperture as the distance increases. To check that you'd need to use a profiler, or perhaps a BeamTrack PPS (Power/Position/Size) sensor.
- If you are measuring pulse energies with a diffuser-based pyroelectric sensor: Some users find that when they start with the sensor right up close to the laser and move it away, the readings drop sharply (typically by some 6%) over the first few cm. This is likely caused by multiple reflections between the diffuser and the laser device, which at the closest distance might be causing an incorrectly high reading. You should back off from the source by at least some 5cm, more if the beam is not too divergent.
Needless to say, it’s also important to be sure to have a steady setup. A sensor held by hand could easily be moved around involuntarily, which could cause partial or complete missing of the sensor’s aperture at increasing distance, particularly for an invisible beam.

配件

Fiber Connector Adapters

These adapters allow for power measurement of connectorized fiber-optic cables. The sensor may need an additional mounting bracket to connect to these fiber adapters.

描述	兼容性	库存	价格
7Z08227 SC Fiber Connector Adapter, Power and Energy Sensors	UNIVERSAL	有现货	$302
7Z08226 ST Fiber Connector Adapter, Power and Energy Sensors	UNIVERSAL	有现货	$264
7Z08229 FC Fiber Connector Adapter, Power and Energy Sensors	UNIVERSAL	有现货	$153
1G01236A SMA Fiber Connector Adapter, Power and Energy Sensors	UNIVERSAL	有现货	$74

Sensor Connector to BNC Adapter

The SH to BNC Adapter allows the connection of an Ophir sensor to a current or voltage measuring device for measurement of the raw sensor analog output. A current meter should be used for photodiode sensors. Current or voltage meters can be used for thermal sensors.

	对比	描述	兼容性	图纸、CAD和参数	库存	价格
		7Z11010 BNC Adapter, DB15 Optical Sensor Connector	UNIVERSAL		有现货	$92

Extended Warranty for Sensor

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.