EnergyMax Pyroelectric Sensors

Coherent EnergyMax Pyroelectric Sensors

Ideal for measuring the energy from pulsed lasers

Further Information
» 2009 EnergyMax Sensor Guide

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. 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, refer to the EnergyMax Sensor Guide. 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 .

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 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 General Purpose Sensors

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 has high damage resistance and mechanical durability characteristics compared to the black paint coatings often used on broadband sensors in the past.

Specifications

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

EnergyMax High Rep Rate Sensors

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 models offer the highest sensitivity of the EnergyMax sensors.

Specifications

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

500mJ/cm2 (1064nm, 10ns)

50mJ/cm2 (1064nm, 10ns)

Coating

Diffuse Metallic

Diffuser

No

EnergyMax YAG & Harmonics Sensors

YAG & Harmonics EnergyMax Sensors
with MaxBlack Coating & Diffusers

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

Specifications

J-50-MB-YAG

J-50-MB-IR

J-25-MB-IR

Energy Range

1.5mJ-3J

1.0mJ-3J

1.5mJ-3J

N.E.E.

<50µJ

<100µJ

<50µJ

Wavelength Range

266-2100nm

500-3000nm

532-2100nm

Max. Beam Size

35mm

30mm

12.5mm

Max. Ave. Power

20W

15W

20W

Max. Pulse Width

340µs

1000µs

860µs

Max. PRF

50Hz

30Hz

20Hz

Max. Energy Density
  Based upon 10ns
  (100µs for J-50-MB-IR)

14J/cm2 (1064nm)
2.8J/cm2 (532nm)
0.75J/cm2 (355nm)
1.0J/cm2 (266nm)

>100J/cm2 (2940nm)

5J/cm2 (1064nm)

Coating

MaxBlack

Diffuser

YAG

IR

IR

EnergyMax Excimer Laser Sensors

Excimer Laser EnergyMax Sensors
with MaxUV Coating

The MaxUV-coated EnergyMax sensors are specifically optimised for use with excimer lasers operating at 193 and 248nm. These sensors utilise a unique coating called MaxUV that delivers superior long-term 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.

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

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
(248nm)

520mJ/cm2
(248nm)

200mJ/cm2
(193nm)

400mJ/cm2
(193nm)

260mJ/cm2
(248nm)

200mJ/cm2
(193nm)

Coating

MaxUV

Diffuser

No

Yes

No

Yes

No

No

EnergyMax Quantum Sensor

Quantum EnergyMax Sensors
with pJ Sensitivity

These sensors are based upon silicon and germanium photodiodes that are designed to accurately measure pulses energies as low as 8pJ as well as the average power of pulsed lasers from nW to mW across a broad range of wavelengths. A removable light shield helps to block stray light.

Specifications

J-10SI-LE

J-10SI-HE

J-10GE

Energy Range

8pJ-80nJ (@532nm)

60pJ-775nJ (@532nm)

200pJ-600nJ (@1064nm)

N.E.E.

<0.8pJ

<6pJ

<8pJ

Wavelength Range

325-900nm

325-900nm

800-1700nm

Aperture

10mm

10mm

10mm

Max. Ave. Power

6mW

60mW

15mW

Max. Pulse Width

1µs

1µs

1µs

Max. PRF

10kHz

10kHz

10kHz

Sensor

Silicon

Silicon

Germanium

Diffuser

ND2

ND2

ND2

EnergyMax Heat Sinks

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, refer to the EnergyMax Sensor Guide.
EnergyMax Test Slides

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.
Coherent J-Power Adaptor

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.