%0 Journal Article
%T Absolute self-calibration of the quantum efficiency of single-photon detectors<br>单光子探测器量子效率的绝对自身标定方法
%A Chang Jun-Tao
%A Wu Ling-An
%A <br>常君
%J 物理学报
%D 2003
%I 
%X An absolute self-calibration method is proposed for determining the quantum efficiency of a single photon detector which does not require any standard referenc e or a second detector. The method is based on the time correlation of photon pa irs generated in parametric downconversion. A beam of frequency downconverted ph otons is split at a polarizing beamsplitter then recombined at a second beamspli tter, but with a time delay introduced between them so that the two photons of a n original pair enter the detector one by one. The photoelectric pulses from the detector are split into three paths; a compensating delay is introduced into tw o of the paths so that the two signals arrive simultaneously at a coincidence co unter; the third path goes directly to a photon counter. From the ratio of the r eadings of the two counters we can derive the quantum efficiency of the detector . Two methods are given, one for continuous wave lasers and another for high rep etition rate pulsed lasers.
%K self-calibration
%K quantum efficiency
%K single photon detector
%K coincidence counte r
%K parametric downconversion<br>量子效率，
%K 单光子探测器，
%K 符合测量，
%K 参量下转换
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=580568A6C489B62D&yid=D43C4A19B2EE3C0A&vid=286FB2D22CF8D013&iid=94C357A881DFC066&sid=9D30FB531DC548C0&eid=BE14F47B38DC36BB&journal_id=1000-3290&journal_name=物理学报&referenced_num=4&reference_num=7