EnergyMax Pyroelectric Sensors 
Ideal for measuring the energy 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. 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.
 | 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 |
 | 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 |
 | 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 |
 | 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 |
 | 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 |
 | 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 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. |
 | 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. |
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