基于PPLN晶体的单光子探测器定标研究  

CALIBRATION OF SINGLE PHOTON DETECTORS BASED ON PPLN

作　　者：张洋洋 李健亮 冯志勇[1] 冯瑜[1] ZHANG Yang-yang;LI Jian-liang;FENG Zhi-yong;FENG Yu(Shenyang Ligong University, Shenyang, Liaoning 110159, China)

机构地区：[1]沈阳理工大学理学院,辽宁沈阳110159

出　　处：《井冈山大学学报（自然科学版）》2018年第6期14-20,共7页Journal of Jinggangshan University (Natural Science)

基　　金：辽宁省自然科学基金项目(20170540783)

摘　　要：从光学二次谐波入手分析影响转换效率的主要因素,引出相位匹配条件,从而提出基于周期极化晶体的准相位匹配,研究周期调谐、温度调谐等多种调谐方式来调控输出光的波长,有利于纠缠源在更宽光谱范围内得以应用。通过532nm的连续激光器泵浦周期性极化的掺镁铌酸锂晶体,采用e→e+e相位匹配,利用了介质的最大非线性系数d_(33),通过周期调谐方式,在满足准相位匹配的模式下制备出高质量的纠缠光源,叙述了探测器量子效率的定标原理,提出了一种基于高亮度纠缠源的单光子探测器量子效率定标系统,为高精度量子效率定标奠定了良好的基础。Starting from the second harmonic generation to analyze the main influencing factors of conversion efficiency,then introducing the phase matching condition,the quasi-phase matching based on periodically poled crystal is proposed.Various tuning methods,such as periodic tuning and temperature tuning,are used to regulate the wavelength of the output light.It is beneficial to the application of the entangled source in a wider spectral range.Using a532nm continuous laser to pump the poled lithium niobate crystalperiodically.In order to use the largest nonlinear coefficient d33of the crystal,a phase matching method of e→e+e and a periodic tuning method are used to generate a high-quality entangled source in the quasi-phase matching mode.We describe the principle of efficiency calibration of single photon detectors and propose a system of efficiency calibration based on high-light entangled source,which has laid a good foundation for high-precision quantum efficiency calibration.

关 键 词：纠缠源 准相位匹配 量子效率 铌酸锂晶体 

分 类 号：TN249[电子电信—物理电子学]