基于波段可调关联光子源的量子效率测量系统研究

随着单光子探测器应用领域的拓展,其覆盖波段不断增加,为满足不同波段探测器量子效率定标的需求,研究基于波段可调关联光子源的量子效率测量系统意义重大。设计了角度相位匹配的波段可调关联光子源,计算了多波段晶体的相位匹配曲线,搭建了光源系统及符合测量平台。测量了参考通道和符合通道的光子数,分析实验数据,完成了信号光通道探测器量子效率的测量。单光子探测器在1550 nm波段的量子效率为9.42%,与出厂数据在相应波长处量子效率偏差为0.58%,验证了方法的可行性,为进一步发展高精度的多波段量子效率测量系统奠定了基础。

RESEARCH ON QUANTUM EFFICIENCY CALIBRATION SYSTEM BASED ON BAND-TUNABLE CORRELATED PHOTON SOURCE

With the expansion of single-photon detectors, the increasing coverage band, and the need to meet the quantum efficiency calibration of different band detectors, it is of great significance to study the quantum efficiency measurement system of band-tunable correlated photon sources. We design an angular phase-matched band-tunable correlated photon source, calculate the phase matching curve of the crystal, and build a light source system and a measurement platform. The reference channel and the number of photons matching the channel are measured, and the measurement of the quantum efficiency of the signal light channel detector is completed. The quantum efficiency of the single photon detector in the 1550 nm band is 9.42%, and the quantum efficiency deviation from the factory data at the corresponding wavelength is 0.58%. This proves the feasibility of the method and lays a foundation for further development of high-precision multi-band quantum efficiency measurement system.