High-efficiency single-photon detection system and method applied to conversion camera on area array

Abstract

The invention provides a high-efficiency single-photon detection system and method applied to an area array up-conversion camera. The system at least comprises a core processing module, an active quenching module, a rapid recovery module, an adjustable high-voltage module, an adjustable medium-voltage module, a counting signal processing module and a protection module. The core processing module is configured to enable the avalanche diode to work in a Geiger mode through the adjustable high-voltage module, acquire an avalanche signal of a cathode of the avalanche diode through the counting signal processing module, and perform active quenching control of the avalanche diode through the active quenching module and the adjustable medium-voltage module. The avalanche diode is quickly recovered to Geiger mode control through the quick recovery module; the protection module is configured to control the connection between the active quenching circuit and the avalanche diode according to a voltage signal generated by the avalanche signal on the sampling resistor; the dark counting is reduced, the detection efficiency is improved, and the saturation counting rate is improved.

Description

technical field [0001] The invention relates to the technical fields of quantum detection and quantum communication, in particular to a high-efficiency single-photon detection system and method applied to an area array up-conversion camera. Background technique [0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art. [0003] Quantum imaging in the near-infrared band is an important direction of scientific and applied research in recent years. It is an important branch of quantum precision measurement and has broad application prospects. In the field of quantum imaging, single-photon array detectors are usually used as detection units. Wherein, the array detector is composed of one-dimensional or two-dimensional array single-photon detection pixels, and each single-photon detection pixel operates independently. [0004] At present, there are domestic and international reports of 32×3...

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Problems solved by technology

[0006] At present, due to the limitation of detection technology, the quenching circuit of commercial single-photon detectors is mostly carried out in a passive and gating manner. The gating method requires the synchronization of the gate signal and the optical signal, and its application fields have certain limitations, such as laser ranging , Lidar imaging and other applications where the photon arrival time is unknown, so the gating method cannot be used; while passive quenching generally adopts a large resistance method, the quenching time or recovery time is long, and a correspondingly longer dead time needs to be set. As a result, the potential of the detector's detection efficiency and counting rate has not been fully realized, and some applications that require high detection efficiency and high counting rate cannot be met.

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