Single Photon Detectors

LBTEK's Single Photon Detectors are ultra-sensitive photodetectors based on Si-APD. The detection wavelength range covers 400-1100 nm and can operate in both linear mode and Geiger mode. In Geiger mode, the gain exceeds 60 dB. The SPD series features a unique high-performance active quenching circuit, enabling continuous single-photon detection and supporting detection gates of arbitrary width and period. This circuit achieves avalanche quenching with over 20 dB suppression, optimizing the performance of the SPD series. The SPD series detectors operate at a low temperature of -30 °C through internal cooling to achieve the best signal-to-noise ratio. The cooling module is controlled by an efficient TEC with a precision of ±0.2 °C. The effective photosensitive detection area of the detector can reach up to 300 μm. The single-photon counting signal is converted into a digital TTL signal and transmitted via an SMA interface. Its highly integrated modular design facilitates OEM applications and industrial integration.