Low-dark count single-photon detection device for irradiation environment and method

Abstract

The invention relates to a low-dark count single-photon detection device for irradiation environment and a method using the low-dark count single-photon detection device to perform single-photon detection. The device includes an avalanche photodiode, a first-stage refrigeration structure, a temperature acquisition module, a temperature control algorithm module, a temperature control circuit and athermoelectric refrigeration module; the avalanche photodiode is used for detecting inputted single-photon-order optical signals under a Geiger mode; the first-stage refrigeration structure is used for controlling the installation ambient temperature of the avalanche photodiode device according to control signals; the temperature acquisition module is used for acquiring the temperature signals ofthe avalanche photodiode; the temperature control algorithm module is used for receiving the temperature signals of the avalanche photodiode and performing analysis according to the temperature of theavalanche photodiode and the current target temperature of the avalanche photodiode so as to obtain required temperature control signals; the temperature control circuit is used for generating driving control signals according to the temperature control signals given by the temperature control algorithm module; and the thermoelectric refrigeration module is used for adjusting the temperature of the avalanche photodiode. With the device adopted, the increase of the speed of dark count which is caused by irradiation can be effectively suppressed, and the difficulty of applying a low-dark countsingle-photon detector to the irradiation environment can be eliminated.

Description

technical field [0001] The present invention relates to the field of quantum information and laser radar, and further relates to a low dark count single photon detection device and method in an irradiation environment, in particular to a low dark count single photon detection device and method applied in a space radiation environment method. Background technique [0002] With the development of space technology, quantum information and lidar based on satellite platforms have expanded their application scope and become the fields that countries are rushing to research. In quantum information, single-photon lidar and other fields, single-photon detection technology is used to detect weak signals of single-photon magnitude, and the realization of single-photon detectors with high detection efficiency and low dark count has become a key factor restricting applications. [0003] Single-photon detectors mainly include single-photon detectors based on avalanche photodiodes (APDs),...

AI Technical Summary

Problems solved by technology

Theoretical and experimental studies have shown that space irradiation, such as total ionization dose, displacement damage, etc., has little effect on APD detection efficiency, time wobble, post-pulse probability and other characteristics, but it will cause a significant increase in APD dark count

For ordinary commercial SiAPDs, such as products with more than 50% detection efficiency and a dark count as low as 25ps, in a simulated 500km satellite orbit, under the condition of space proton irradiation, the daily dark count increment is more than 100cps, which eventually leads to a dark detector. The count increases significantly in a short period of time, making it difficult to apply to fields with strong demand for low dark counts, such as quantum information and lidar

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