Detectors

The SPCM-AQRH uses a unique silicon avalanche photodiode (SLiK) with a circular active area, achieving peak photon detection efficiency greater than 70% at 650 nm over a 180 µm diameter, with unmatched uniformity over the full active area. A TTL-level pulse is generated for each photon detected and the signal is available at the BNC connector at the rear of the module.

Excelitas offers Avalanche Photodiodes (APDs) on both Silicon (Si) and InGaAs materials. Si APDs cover the spectral range of 400 nm to 1100 nm and the InGaAs APDs cover 950 nm to 1550 nm.

Excelitas utilises Silicon and InGaAs materials for their photodiodes to provide detection from 220 nm to 1700 nm. These devices are offered in a variety of sizes to meet customer sensitivity and speed requirements. Many different types of photodiodes are available to serve a wide variety of applications.

Precise beam positioning can be achieved by using quadrant PIN and avalanche photodetectors from Excelitas. They are designed with 4 pie-shaped quadrants, each formed using varied doping processes, thus minimising the “dead” space between each quadrant.