Single Photon Counting Modules

Single photon counting modules (SPCM) are used to count individual photons. LASER COMPONENTS' photon counters with the brand name COUNT^® offer high quantum efficiency, very low dark count rates (DCR) and a wide dynamic range. 

Functionality and operation  
The modules of the COUNT^® series from LASER COMPONENTS consist of a particularly low-noise silicon avalanche photodiode and specially developed high-voltage (HV) electronics with quenching circuitry and temperature management. They can be operated at wavelengths between 400 nm and 1000 nm. Incoming photons generate avalanche-like electrical pulses that are read out at the TTL output. 

100 % quality control 
All specifications of our COUNT^® modules are checked at our in-house test station. This combines ultra-short pulsed diode lasers, computer-controlled motion stages and a reference power meter with a system for time-correlated single photon counting (TCSPC), the Time Tagger Ultra from Swabian Instruments. 

Special features of the COUNT^® modules 

• Single photon detection with high quantum efficiency 
• Active quenching switch for defined short dead time and accurate measurement 
• Extremely low dark count rate (DCR) with ≤10 Hz available 
• Low afterpulse probability (AP) 
• Short timing jitter 
• Ultra-fast TTL pulses 
• Optional fiber connection (FC)