Pyroelectric Detector Physics

A pyroelectric material has electric polarization even in the absence of an applied voltage. The materials are usually crystalline. On heating, the material expands and produces a change in the polarization which builds up a charge on opposite surfaces. This causes a current to flow in the circuit which connects the surfaces. Since it is the change in temperature which produces the current, pyroelectric detectors respond only to pulsed or modulated radiation. They respond to variations in radiation much more rapidly than thermocouples or thermopiles and are unaffected by steady background radiation.

Schematic drawing of a pyroelectric detector.

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 sensitve pyroelectric sensor, capable of measuring as low as 1 uJ via a broad specral 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.  The 818E series detectors will no longer available for purchase once the stock is depleted.