为在相关光子定标技术工程化过程中选择合适的泵浦机制及相位匹配模式, 开展了基于连续和脉冲激光的相关光子比对实验.采用355 nm连续激光泵浦偏硼酸钡晶体产生相关光子对, 对晶体吸收、透射损耗以及光学元件透过率进行测量和修正, 同时使用基于时间幅度转换的符合测量方法,得到单光子探测器量子效率为59.15%.利用518 nm脉冲激光泵浦周期极化磷酸钛氧钾晶体, 采用准相位匹配技术获取相同波段的相关光子, 基于时间幅度转换的符合测量方法得到单光子探测器量子效率为59%.比对实验结果, 两套定标装置方法的测量结果之差在0.25%以内, 主要误差来源于单光子探测器的响应非线性、光路透过率修正误差和单光子探测量子效率面非均匀性.实验结果验证了相关光子定标技术可随时随地复现的优点, 以及相关光子定标结果不受泵浦机制差异和实验装置差异的影响, 可为相关光子技术工程化中的激光器工作模式和相位匹配方式的选择提供参考依据.

The calibration accuracy was checked by the comparison of experimental measurements from different laboratories. To select the appropriate pumping mechanism and phase matching mode in the engineering process of correlated photon technology, the intercomparison of correlated photon method based on continuous wave and pulsed laser pumping was carried out. The 355 nm continuous wave laser was used to pump the beta-barium borate crystal to generate correlated photon pairs. The quantum efficiency of single photon detector was measured by correcting the absorption and transmission loss in crystal and mesuring the transmission of optical elements. The calibration result of quantum efficiency based on coincidence measurement is 59.15%. Moreover, the 518 nm pulsed laser was used to pump periodically polarized potassium titanium phosphate crystal. Quasi-phase matching technique was used to get the same wavelength correlated photon. The measurement result of quantum efficiency of single photon detector is 59%. The nonuniformity of measurement results between two calibration devices is less than 0.25%. The main error sources of the intercomparison experiment result from the nonlinearity of single photon detector, the measurement error of optical elements transmission and the homogeneity of single photon detector. The advantages of the correlated photon technology which can be reproduced anytime and anywhere are verificated. In fact, the results obtained by correlated photon method is not affected by the diversity of laser pumping mechanism and phase matching modes. This conclusion has certain guiding significance for the choice of laser pumping mechanisms and phase matching modes in the engineering design process of correlated photon technology.