【摘要】 讨论自发参量下转换双光子场的产生机理，提出一种基于自发参量下转换双光子场绝对测量光电探测器量子效率的新方法。基于这一方法对光子计数型光电倍增管的量子效率进行测量，并将实验结果与常规方法测得的结果进行比较。更多还原

【Abstract】 A new method of absolute calibration of photodetector′s sensitivity based on spontaneous parametric down conversion (SPDC) biphoton field is discussed.The process of SPDC is studied theoretically.An experimental system has been set up. The sensitivity of a photon counting photomultiplier tube was measured, and the results were compared with that obtained using conventional method.更多还原