Acta Photonica Sinica ›› 2019, Vol. 48 ›› Issue (6): 612002-0612002.doi: 10.3788/gzxb20194806.0612002

• Instrumentation, Measurement and Metrology • Previous Articles     Next Articles

Intercomparison of Correlated Photon Method Based on Continuous Wave and Pulsed Laser Pumping

GAO Dong-yang1,4, LIU Chang-ming2, HU You-bo3, SHI Xue-shun2, XIA Mao-peng1, LI Jian-jun1, ZHENG Xiao-bing1, WANG Heng-fei2   

  1. 1. Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, 230031, China;
    2. National Opto-Electronic Primay Metrology Laboratory, The 41 st Research Institute of CETC, Qingdao, Shandong 266555, China;
    3. University of Science and Technology of China, Hefei, 230031, China;
    4. Shanghai Institute of Spaceflight Control Technology, Shanghai, 201109, China
  • Received:2018-09-10 Online:2019-06-25 Published:2018-12-28
  • Supported by:

    National Key Research and Development Program of China (No. 2018YFB0504602), National Defense Basic Scientific Research Project of Technology (JSJL2016210C002)


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.

Key words: Radiometric calibration, Correlated photon, Quantum efficiency, Single photon detector, Spontaneous parametric down conversion

CLC Number: