物理学报2016，Vol.65Issue(19)：194211-1-194211-9,9.DOI:10.7498/aps.65.194211
I类自发参量下转换相关光子圆环的时间相关特性研究∗
Research on the time-correlation characterisrtic of correlated photon circles generated by the typ e-I sp ontaneous parametric down-conversion
摘要
Abstract
The optical radiometric calibration method based on correlated photons generated by spontaneous parametric down-conversion (SPDC) is a promising method, because it is based on the basic physical phenomena and does not need radiometric traceability. At the present, the SPDC calibration technology is applicable for the photon-counting detector with a highest calibration accuracy of 0.18%. More and more researchers are making effort to improve its calibration accuracy and expand its applicable targets to analog detectors. Correlated photon circles have the high photon rate characteristic. The photon rates of signal and idle light can be improved significantly by using correlated photon circles in calibration. It has very important significance to study the time-correlation characteristic of correlated photon circles. In this paper, the spatial distribution of emission angle of the broadband (450–1000 nm) correlated photons generated by type-I spontaneous parametric down-conversion is presented through the theoretical calculations. The ZEMAX® optical software is used to design the optical system which can receive the broadband correlated photon circles and remove the pump laser which is the main source of stray light. The 355 nm wavelength laser is used to pumpβ-barium borate (BBO) crystal to generate the broadband correlated photon circles. A low-light-level CMOS camera is used to adjust and align the opt-mechanical system. Finally, the 430 nm–860 nm correlated photon circles are received by the optical system and detected by the low-light-level CMOS camera. An experimental measurement system is established to measure the time-correlation characteristics of 685 nm and 736.89 nm correlated photon circles. Using 1.0 mW continuous-wave laser to pump BBO crystal, a coincidence peak is observed evidently. The results show that the correlated photon circles generated by type-I SPDC have the characteristics of time-correlation and high photon rates. It can be conductive to improving optical radiometric calibration accuracy based on correlated photons and promoting the development and application in analog detector calibration.关键词
相关光子圆环/宽谱段/时间相关特性/光学设计Key words
correlated circle/broad spectral band/the characteristic of time-correlation/optical design引用本文复制引用
刘岩,李健军,高冬阳,翟文超,胡友勃,郭园园,夏茂鹏,郑小兵..I类自发参量下转换相关光子圆环的时间相关特性研究∗[J].物理学报,2016,65(19):194211-1-194211-9,9.基金项目
国家高技术研究发展计划(批准号:2015AA123702)和国家自然科学基金(批准号:11204318,61275173)资助的课题 （批准号:2015AA123702）
