摘要
介绍了一种新型的辐射定标方法，利用二极管泵浦的、倍频的固体钛宝石连续激光器倍频后产生的351nm紫外激光抽运非线性BBO晶体，定标了光电倍增管在633 nm、702 nm和789 nm的量子效率，介绍了测量原理和实验装置，观察到符合峰现象，分析了触发通道滤光片的带宽、探测器的位置校准、以及探测器死时间对测量结果的影响，最后分析了这种定标方法的不确定度，定标结果的相对合成不确定度低于5.8%。这种方法可以发展成为一种高精度的新型辐射定标方法。.
A new calibration method for detectors can be realized with the correlated photons generated in spontaneous parametric down-conversion （SPDC） effect of nonlinear crystal. A CW uhraviolet（351 nm） ,diode-pumped, frequency-doubled, solid-state laser was used to pump BBO crystal. The quantum efficiencies of the photomuhiplier at 633 nm, 702 nm and 789 nm are measured respectively. An absolute calibration system for detector quantum efficiency is described and its principle and experimental setup are introduced. The coincidence peaks are observed using coincidence circuit. Some measurement factors including the filter bandwidth of trigger channel, the detector position alignment and detector dead time are analyzed. In the end, the uncertainties of this calibration method are analyzed. The total calibration relative uncertainties are less than 5.8%. It is believed that the accuracy of this method can be improved in the future.
出处
《计量学报》
CSCD
北大核心
2009年第1期1-5,共5页
Acta Metrologica Sinica
基金
国家自然科学基金（60378027）
关键词
计量学
辐射定标
相关光子
参量下转换
量子效率
Metrology
Radiometric calibration
Correlated photons
Parametric downeonversion
Quantum efficiency
