Precise measurements of pulsed laser energy can be accomplished with Newport’s 818J Series Energy Detectors, which utilize crystalline pyroelectrics. Each detector includes NIST-traceable calibration and is packaged in an EMI-shielded cylindrical housing that mounts directly to our English posts.
Calibrated measurements can be performed by ordering the /CM versions of these detectors for use with Newport’s 1835-C and 2835-C Optical Meters.
The 818J-08B detector features a compact, low-profile design, thus allowing energy measurements in very tight spaces. This detector can be used on its back or mounted on a post, for either vertical laser setups or horizontal laser beams.
A patented crystal material is utilized in Newport’s large-area energy detectors, delivering higher repetition rates and better spatial uniformity than detectors built with conventional pyroelectric materials, while it is less sensitive to microphonic noise and temperature.
Large expanded beams can be accommodated with detector diameters of 25 and 50 mm. Black-organic coated 818J-25B and 818J-50B detectors are suitable for most applications. This coating flattens spectral response from UV to deep IR and eliminates beam retro-reflection, while providing more damage resistant operation, but repetition rates are limited to 50 and 100 pps respectively. Uncoated 818J-25 and 818J-50 detectors have a thin-film metal-oxide coating and are suitable ...

Precise measurements of pulsed laser energy can be accomplished with Newport’s 818J Series Energy Detectors, which utilize crystalline pyroelectrics. Each detector includes NIST-traceable calibration and is packaged in an EMI-shielded cylindrical housing that mounts directly to our English posts.
Calibrated measurements can be performed by ordering the /CM versions of these detectors for use with Newport’s 1835-C and 2835-C Optical Meters.
The 818J-08B detector features a compact, low-profile design, thus allowing energy measurements in very tight spaces. This detector can be used on its back or mounted on a post, for either vertical laser setups or horizontal laser beams.
A patented crystal material is utilized in Newport’s large-area energy detectors, delivering higher repetition rates and better spatial uniformity than detectors built with conventional pyroelectric materials, while it is less sensitive to microphonic noise and temperature.
Large expanded beams can be accommodated with detector diameters of 25 and 50 mm. Black-organic coated 818J-25B and 818J-50B detectors are suitable for most applications. This coating flattens spectral response from UV to deep IR and eliminates beam retro-reflection, while providing more damage resistant operation, but repetition rates are limited to 50 and 100 pps respectively. Uncoated 818J-25 and 818J-50 detectors have a thin-film metal-oxide coating and are suitable for repetition rates up to 400 pps.
Superior low-noise performance can be accomplished with two battery-powered models using a pre-amplifier. Both models, the 818J-09 and 818J-09B (black-organic coated), are ideal with pulsed flashlamps, diode-pumped Nd:YAG lasers and tunable dye lasers. These 9 mm diameter pyroelectric detectors offer broad spectral response from 0.19 micron to 20 microns and repetition rates to 4,000 pps (200 pps for the 818J-09B). A three-position switch on the 818J-09 allows selection of integration time constant and voltage output for greater versatility.
Uncoated energy detectors can be damaged permanently if the damage threshold is exceeded. Energy detectors with a black-organic coating are more resistant to damage and may be re-coated if damage occurs. Repeated damage causes the black-organic coating to deteriorate gradually, although accuracy is not immediately affected. For best performance, detectors with black-organic coatings should be re-coated periodically.