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Pyroelectric Sensors

Ideal for measuring the energy per pulse from pulsed lasers

Coherent's EnergyMax pyroelectric sensors were developed to provide high accuracy energy measurements with pulsed lasers over a broad range of wavelengths, repetition rates, pulse energies and beam diameters.

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Technical Guide	EnergyMax Sensors	Accessories
» Selection Guide	» General Purpose » High Repetition Rate » Excimer » YAG/Harmonics & IR	» Heat Sinks » Test Slides » J-Power Adaptor

Selecting Your EnergyMax Sensor

EnergyMax sensors are offered with 10, 25 & 50mm diameter apertures and with a choice of four finishes to suit different laser types. For assistance in selecting the right sensor for your laser, go to our Sensor Selection Guide.

EnergyMax sensors are highly linear in terms of repetition rate, laser pulse width, and power level. They are also accurate across a broad range of wavelengths due to onboard wavelength compensation built into each sensor. In addition, sensors provide automatic temperature compensation to account for changes in ambient temperature, as well as heat generated by absorption of the laser energy. This capability also enables the use of user-installable heat sinks for higher average power handling capability.

Research conducted by Coherent has revealed that traditional pyroelectric sensors suffer from a variety of errors that can make energy measurements deviate significantly with the repetition rate of the laser, the pulse duration, the average power and with temperature. Coherent designed its EnergyMax line of pyroelectric energy sensors to set new standards for linearity, damage threshold, extended dynamic range and broad spectral response. Accuracy has also been enhanced with lower noise electronics, improved detector coatings and new, state-of-the-art calibration facilities. In short, EnergyMax gives you readings that you can trust.

EnergyMax	Specification
Energy Linearity	+/- 3% (over full dynamic range)
Average Power Linearity	+/- 2% (+/- 1% typically)
Repetition Rate Linearity	+/- 1% (+/- 0.5% typically)
Wavelength Compensation Error	+/- 1% to +/- 2% (sensor dependent)
Pulse Width Error	0.5% (for pulses < 10µs)
Noise Equivalent Energy	20:1 to 30:1 (sensor dependent)

Compatible Laser Power & Energy Meters

Coherent's LabMax TOP laser power & energy meter is compatible with all EnergyMax sensors. The FieldMax II P & TOP meters are compatible with all EnergyMax sensors except for the high repetition rate models.

General Purpose EnergyMax Sensors with MaxBlack Coating

These sensors allow measurements over a wide range of wavelengths, beam diameters, average power levels and repetition rates. The MaxBlack coating on these sensors have high damage resistance and mechanical durability characteristics compared to the black paint coatings often used on broadband sensors in the past.

» Download Datasheet

 

 

Specification	J-50-MB-HE	J-50-MB-LE	J-25-MB-HE	J-25-MB-LE	J-10-MB-HE	J-10-MB-LE
Energy Range	1mJ-2J	250µJ-500mJ	500µJ-1J	25µJ-50mJ	10µJ-20mJ	300nJ-600µJ
N.E.E.	<33µJ	<8µJ	<16µJ	<1µJ	<0.5µJ	<20nJ
Wavelength Range	0.19-12µm
Aperture	50mm	50mm	25mm	25mm	10mm	10mm
Max. Ave. Power	10W	10W	5W	5W	4W	4W
Max. Pulse Width	17µs
Max. PRF	300Hz	300Hz	1000Hz	1000Hz	1000Hz	1000Hz
Max. Energy Density	500mJ/cm2 (1064nm, 10ns)
Coating	MaxBlack
Diffuser	No

High Rep Rate EnergyMax Sensors with Diffuse Metallic Coating

These sensors incorporate a diffuse metallic coating that enables measurement at high and low repetition rates across a wide range of energies, wavelengths and beam sizes. The diffuse metallic coating has a higher damage resistance at 532nm and shorter wavelengths than the MaxBlack coating and has proven long-term stability in the DUV. These sensors offer the hghest sensitivity of the EnergyMax sensors.

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Specification	J-50-MT-10kHz	J-25-MT-10kHz	J-10-MT-10kHz
Energy Range	500µJ-1J	50µJ-100mJ	100nJ-200µJ
N.E.E.	<16µJ	<2µJ	<10µJ
Wavelength Range	0.19-2.1µm
Aperture	50mm	25mm	10mm
Max. Ave. Power	20W	10W	1W
Max. Pulse Width	1.7µs
Max. PRF	10kHz
Max. Energy Density (10ns)	500mJ/cm2 (at 1064nm)		50mJ/cm2 (at 1064nm)
Coating	Diffuse Metallic
Diffuser	No

YAG & Harmonics EnergyMax Sensors with MaxBlack Coating & Diffusers

These sensors are specifically designed for use with very high energy and peak power lasers operating at relatively low repetition rates, such as Nd:YAG, Ruby and Ho:YAG. The J-50MBYAG sensor can be used with beams up to 25mm in diameter and can work at 1064, 532, 355 and 266nm without the need to change or self-calibrate diffusers or any other accessories.

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Specification	J-50-MB-YAG		J-25-MB-IR
Energy Range	1.5mJ-3J		1.5mJ-3J
N.E.E.	<50µJ		<50µJ
Wavelength Range	0.266-2.1µm		0.532-2.1µm
Aperture	50mm		25mm
Max. Ave. Power	20W		20W
Max. Pulse Width	340µs		860µs
Max. PRF	50Hz		20Hz
Max. Energy Density (10ns)	14J/cm2 (1064nm) 2.8J/cm2 (532nm) 0.75J/cm2 (355nm) 1.0J/cm2 (266nm)		5J/cm2 (1064nm)
Coating	MaxBlack
Diffuser	YAG		IR

Excimer Laser EnergyMax Sensors with MaxUV Coating

The MaxUV-coated EnergyMax sensors are specifically optimised for use with ArF excimer lasers operating at 193nm and KrF lasers at 248nm. These sensors feature high accuracy and large active areas (up to 50mm), and utilise a unique coating called MaxUV that delivers superior long-term damage resistance. Two of the 50mm diameter models incorporate a DUV quartz diffuser for increased coating damage resistance. For UV repetition rates faster than 400Hz, refer to the J-25-MT-10kHz and J-50-MT-10kHz sensors which also perform well in the DUV with slightly lower damage resistance than the MaxUV coating.

» Download Datasheet

Specification	J-50-MUV-248	J-50-MUV-248	J-50-MUV-193	J-50-MUV-193	J-25-MUV-248	J-25-MUV-193
Diffuser Fitted	No	Yes	No	Yes	No	No
Energy Range	500µJ-1J	500µJ-1J	125µJ-250mJ	125µJ-250mJ	125µJ-250mJ	50µJ-100mJ
N.E.E.	<16µJ	<16µJ	<4µJ	<4µJ	<4µJ	<2nJ
Wavelength Range	0.19-2.1µm	0.19-0.266µm	0.19-2.1µm	0.19-0.266µm	0.19-2.1µm	0.19-2.1µm
Aperture	50mm	50mm	50mm	50mm	25mm	25mm
Max. Ave. Power	10W	15W	10W	18W	5W	5W
Max. Pulse Width	86µs	86µs	86µs	86µs	43µs	43µs
Max. PRF	200Hz	200Hz	200Hz	200Hz	400Hz	400Hz
Max. Energy Density (10ns)	260mJ/cm2 (at 248nm)	520mJ/cm2 (at 248nm)	200mJ/cm2 (at 193nm)	400mJ/cm2 (at 193nm)	260mJ/cm2 (at 248nm)	200mJ/cm2 (at 193nm)
Coating	MaxUV

 Heat Sinks

EnergyMax heat sinks are accessory parts which can be used to increase the average power capability of the sensor head to which they are fitted by allowing measurement at higher repetition rates or at higher energy levels. The heat sinks are easily installed by threading them onto the back of a sensor housing with a 1/4-20 cap screw retained within the heat sink. For performance specifications and sensor head compatibility, go to our EnergyMax technical briefing.

» Download Datasheet

EnergyMax Test Slides

For protection of your sensor when measuring unknown beams, the test slide is inserted into the laser beam and then examined for damage. These test slides are coated with the same absorbing coating as the pyroelectric sensors. If coating damage is visible, attenuation is required before measuring the laser. One test slide is included with each EnergyMax sensor purchased. Additional test slides are available to purchase. 

 

 

EnergyMax Test Slide Part No.	Description
0011-4311	Pyroelectric test slide - black coating
1129175	Pyroelectric test slide - Diffuse Metallic (DM) coating
0011-4313	Pyroelectric test slide - MaxUV (MUV) coating
0011-4314	Pyroelectric test slide - MaxBlack (MB) coating

J-Power Adaptor

The J-Power is a DB-25 to BNC electrical adaptor that allows EnergyMax pyroelectric sensors to be connected to an oscilloscope or other recording device. The J-Power adapter powers the active sensor circuit and passes the raw output voltage of the sensor straight through to the BNC connector. The peak voltage of the output (as referenced from baseline voltage) can then be measured using an oscilloscope or other analog-to-digital input device. The calibrated peak voltage represents the integrated energy of the laser pulse.

» Download J-Power Datasheet