| Research in absolute calibration of single photon detectors by means of correlated photons |
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| 作者姓名： | 冯瑜 郑小兵 李健军 张伟 |
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| 作者单位： | Remote Sensing Laboratory Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences，Remote Sensing Laboratory Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Remote Sensing Laboratory Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Remote Sensing Laboratory Anhui Institute of Optics and Fine Mechanics，Chinese Academy of Sciences，Hefei 230031，Hefei 230031，Hefei 230031，Hefei 230031 |
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| 基金项目： | This work was supported by the National Natural Science Foundation of China under Grant No. 60378027. |
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| 摘 要： | There are two general methods in radiometric calibration of detectors, one is based on radiation sources and the other based on detectors. Because the two methods need to establish a primary standard of high precision and a transfer chain, precision of the standard will be reduced by extension of the chain. A new calibration method of detectors can be realized by using correlated photons generated in spontaneous parametric down-conversion (SPDC) effect of nonlinear crystal, without needing transfer chain. Using 351.1-nm output of a tunable laser to pump β-barium borate (BBO) crystal, an absolute calibration experimental system of single photon detectors based on correlated photons is performed. The quantum efficiency of photomultiplier (PMT) at 702.2 nm is measured by the setup. Advantages of this method over traditional methods are also pointed out by comparison.
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