相关光子符合计数的实现及修正  

Realization and correction of coincidence counting setup used in correlated photon detection

作　　者：吕亮[1,2] 林延东[2] 

机构地区：[1]北京理工大学光电学院,北京100086 [2]中国计量科学研究院光学所,北京100013

出　　处：《光学精密工程》2011年第5期1005-1012,共8页Optics and Precision Engineering

基　　金：国家科技部科技支撑项目(No.2006BAF06B05)

摘　　要：为了实现利用非线性晶体自发参量下转换(SPDC)产生的相关光子测量光电探测器量子效率,对相关光子符合计数装置的设计及符合计数方法的系统修正进行了研究。介绍了SPDC相关光子的产生机理以及利用其进行光电探测器量子效率测量的原理。设计了两种不同的符合计数装置,"门控双通道光子符合计数装置"和"基于TAC/MCA的符合计数装置"。分析了两种计数装置符合结果的偶然符合、丢失符合、符合器死时间、探测器死时间等误差,并分别给出了修正因子及修正因子的计算和测量方法。结果表明:修正后两种方法量子效率测量结果的一致性<0.4%,均能满足量子效率符合测量的需要,提出的修正方法也具有很好的可操作性。With the aim to realize Quantum Efficiency（QE） measurement of photon detectors based on Spontaneous Parametric Down-conversion（SPDC）,two type of coincidence count systems were set up,the correction factors of coincidence count were analyzed and the real experimental methods of correction factors were given.Firstly,the principle of SPDC and the technique using SPDC to calibrate the QE of photo detectors were introduced.Then the design of two type of coincidence count systems,gated dual-photon counter coincidence count system and TAC/MCA coincidence count system,were introduced.Finally,the main correction factors,accidental coincidence,missing coincidence,dead time of counters and detectors were analyzed,and the calculation and test methods were also given.Experimental results show that the deviation between this two type of coincidence setups is less than 0.4% after correction,which indicates that the two setups can satisfy the requirement of QE measurement.

关 键 词：自发参量下转换 相关光子 量子效率 符合计数 

分 类 号：TP211.6[自动化与计算机技术—检测技术与自动化装置] TH724[自动化与计算机技术—控制科学与工程]