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919E Pyroelectric Laser Pulse Energy Sensors

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919e pyroelectric energy detector with diffuser removed

Overview

919E Series pyroelectric pulse energy detectors use innovative, patented technology which facilitates accurate and repeatable laser measurements of pulses over an extensive range of laser pulse energies.

Up to 46 mm aperture
Up to 30 J pulse energy measurement
Photodiode energy detectors for measurement down to 1 nJ
Metallic coating pyroelectric detectors for high rep rates
BF coating pyroelectric detectors for highest damage threshold
Measure lasers with pulse widths of 20 ms or less

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Specifications

Features

Pyroelectric Sensor Physics

The configuration of a typical pyroelectric sensor and its operational output can be seen in the above Figure. A pyroelectric material, which is usually crystalline, possesses an electric polarization, even in the absence of an applied voltage. An incident laser pulse heats the crystal, which causes the material to expand and produce a change in the polarization. Charge builds up on opposite surfaces of the crystal which generates a current flow that charges a capacitor. This charged capacitor induces a voltage whose amplitude change is proportional to the original laser pulse energy. Since it is the change in temperature that produces the current, pyroelectric detectors respond only to pulsed or modulated radiation. They respond much more rapidly to variations in radiation than thermopiles and are unaffected by steady background radiation. Please see our Pyroelectric Sensor Physics technical note for additional information.

Photodiode Pulse Energy Detector

Model 919E-20U-10-20K is a photodiode energy detector for low energies with a 10mm aperture. This model is one of the most sensitive calibrated energy detector available in market. It can measure energies from 1nJ up to 15µJ. It's noise floor is approximately 50 pJ. It can operate at repetition rates up to 20 kHz and covers the spectral range from 0.19 - 1.1µm.

Measure Laser Repetition Rate Up to 25 kHz

The 919E series sensors can reliably measure energy pulses up to 25 kHz laser repetition rate. Select high pulse energy detectors can measure up to 10 kHz rep rate. When connected to our brand new 1919-R Handheld Power & Energy Meter, pulse energy of every pulse up to 6 kHz can be logged.

Sensor Sizes Up to 46 mm

When the diffuser is not in use, the active diameter of Model 919E-30-46-10K is as large as 46 mm. The active diameter is 33 mm even when the diffuser is mounted. In addition, two additional models feature 35 mm diameter.

NIST Traceable Calibration

All the detectors come with a DB15 connector and internal EEPROM for storing factory calibration data, making them directly compatible with Newport's 843-R, 843-R-USB, and the all new 1919-R Optical Power and Energy Meters.

High Sensitivity for Low Pulse Energy

In addition to Model 919E-20U-10-20K, three additional models are introduced for low pulse measurements up to 10 mJ pulses. Model 919E-200U-8-25K is the most sensitive pyroelectric sensor, capable of measuring as low as 1 uJ via a broad spectral range of 0.15 to 12 µm. Choose between 919E-0.1-12-25 and 919E-0.1-12-250, depending on the pulse rep rate of the laser source.

High Energy Level up to 30 J

We also offer five models that can handle high pulse energy. Model 919E-30-46-10K, especially, can handle up to 30 Joules by utilizing a calibrated diffuser with a high damage threshold.

Replacing Obsolete 818E Series Detectors

The 919E Series Pulse Energy Detectors replace the obsolete 818E Series detectors. However, due to the technological differences between the two families, we do not offer a direct replacement cross reference chart. Contact Newport with the specifications of your light source so that we can recommend you the right 919E series detector.