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1.06-µm Single-Photon-Counting APD
Jan 2007
Princeton LightwaveRequest Info
CRANBURY, N.J., Jan. 4, 2007 -- Princeton Lightwave Inc. (PLI), a provider of semiconductor lasers and detectors for optical communications, instrumentation and defense applications, has introduced an indium-phosphide single-photon-counting avalanche photodiode (SPAD) designed for optimum performance at 1.06 µm.

The PLI 1.06-µm SPAD bridges the performance gap between silicon and conventional indium-phosphide devices, PLI said. Silicon, which reaches its maximum responsivity below 1 µm, suffers from very low detection efficiency at 1.06 µm.

"Conventional indium phosphide SPADs, with a responsivity peak at 1.55 µm, have excellent detection efficiency, but the excess noise generated by the unused spectrum increases the dark count rate at 1.06 µm," the company said in a statement.

The device combines an adjustment in the spectral peak through material engineering with single-photon capabilities stemming from PLI's prior designs for longer wavelengths. The result is a SPAD with peak responsivity at 1.06 µm that enables very low dark-count rates while providing a larger detection efficiency -- by an order of magnitude, compared to silicon, PLI said.

The PLI 1.06-µm SPAD is available in 80 and 200 µm, packaged with a thermoelectric cooler inside a windowed TO-8 can. The low dark-count rate allows operations in either gated or nongated mode. A detection efficiency of 50 percent is achievable.

Applications include low-light YAG laser detection and time-resolved spectroscopy in biomedical, lidar and ladar systems designed for remote sensing and for free-space optical transmission.

For more information, visit:; e-mail:

Princeton Lightwave Inc.
2555 US Route 130 S.
Cranbury, NJ 08512
Phone: (609) 495-2600
Fax: (609) 395-9114


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An acronym of light detection and ranging, describing systems that use a light beam in place of conventional microwave beams for atmospheric monitoring, tracking and detection functions. Ladar, an acronym of laser detection and ranging, uses laser light for detection of speed, altitude, direction and range; it is often called laser radar.
optical communications
The transmission and reception of information by optical devices and sensors.
The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
remote sensing
Technique that utilizes electromagnetic energy to detect and quantify information about an object that is not in contact with the sensing apparatus.
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