Free-Running Single Photon Detectors in the Near-Infrared Band

QCD600B is a compact NIR free-running single photon detector that provides a cost-effective solution for asynchronous single photon detection applications.

The product uses the negative feedback InGaAs/InP single photon avalanche diode (NFAD) as the core device to quench the avalanche current quickly and suppress the afterpulsing effect. The detector works in free-running mode that suits for applications with uncertain photon arrival time such as LiDAR and fluorescence lifetime measurements. Moreover, it offers an external gate input port connector dedicated to control whether it is in Geiger mode and avoid saturation or undesired detections. The InGaAs/InP avalanche diode is cooled by thermo electric cooler (TEC) to achieve low dark count rates, and the afterpulse probability is further suppressed by adjusted dead time. The device is fibre-coupled with MMF62.5 and compatible with SMF.

The product can integrate TDC function and use USB2.0 interface for data communication. With special control software, it can realize flexible configuration of various parameters and real-time output of time count distribution data. It is a single photon detector with high performance and low cost which supports a variety of application requirements.