The Single Photon Counting Module (SPCM) has a photon counting efficiency of >60 at 650 nm,

It is a photon counter that can measure wavelengths from 400 nm to 1100 nm. 

It features an integral 2-stage TE cooler, cooler controller, amplifier, and discriminator, 

and TTL output driver.  

It also has a high-voltage DC-to-DC converter, with a drive voltage of 5 Volts. 

The module uses a patented active-quench circuit, which can count more than 30 million photons per second. 

The photosensitive area is 175um, and products with a dark-counter rate of less than 25 counts per second are also possible.

* Application 

- LIDAR

- Particle sizing 

- Photon correlation spectroscopy

- Astronomical observation

- Optical range finding

- Adaptive optics

- Ultra-sensitive fluorescence

- Particle sizing