Research Of Calibration Method For Infrared Single Photon Detector

With the development of modern society and the advancement of technology,in such as low-light night-vision,spectral measurement,optical fiber sensing,quantum optics and other applications,the signal intensity can be obtained is only photon level,so single-photon detectors are essential in above fields of faint light detection.In order to ensure data accuracy and available value,the demand of calibration for quantum efficiency of single photon detector is improving continuously.Traditional calibration method needed to design transfer chain according to different requirements of calibration,transfer train is the major source of error.Entangled photon is one of the most novel physical phenomena in the 20thcentury;its applications include quantum information,quantum optics and other fields.By using time entanglement properties of photon pairs,the researchers focused on the field of calibration for visible single-photon detector,but the calibration for infrared singlephoton detector was put less value on.In order to expand the application of entangled photons in the infrared calibration field and improve the accuracy of calibration for infrared single-photon detector,the calibration method for infrared single-photon detector based on entangled photons was studied in this paper.The methods of conventional radiometric calibration and standard delivery were introduced firstly,and the causes of limitation to improving the accuracy were analyzed.The principles and characteristics of typical infrared single-photon detector were elaborated such as photomultiplier,avalanche photodiodes and other detectors.According to principles of calibration method based on entangled photons,the design of calibration system for infrared single-photon detector was researched.Using single-photon counter module(SPCM)made in Canadian Excelitas Company as the referenced detector,calibration platform for single-photon detector was established.The key technologies such as calculation of nonlinear crystal parameter,optical paths configuration of entangled photons,optimization of coincidence measurement system and suppression of the stray light were solved in our paper.Finally,the calibration experiment for quantum efficiency of infrared single-photon detector was completed.The quantum efficiency of single-photon detector id220 made in Switzerland's IDQ company is(8.71±0.02)% at wavelength 1550 nm.The combined standard uncertainty of measurement result is 6.91%.The initial data agreed well with the consequence provided by the manufacturers,which verified the practical use of our experiment system and laid a solid foundation for further optimizing experimental system,improving precision and expanding application fields of the method.At last,following research ideas was pointed out in this paper.