温度对参量下转换输出角度和转换效率的影响  

Effect of Temperature on the Output Angle and Conversion Efficiency of Parametric Down Conversion

作　　者：钱远东 夏茂鹏[1] 李健军[1] 翟文超[1] 徐明明 QIAN Yuan-dong;XIA Mao-peng;LI Jian-jun;ZHAI Wen-chao;XU Ming-ming(Key Laboratory of Optical Calibration and Characterization,Anhui Institute of Optical and Fine Mechanics,Chinese Academy of Science,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院安徽光学精密机械研究所通用光学定标与表征技术重点实验室,合肥230031 [2]中国科学技术大学,合肥230026

出　　处：《光子学报》2020年第10期200-209,共10页Acta Photonica Sinica

基　　金：国家自然科学基金(No.41805019);国家重点研发计划(No.2018YFB05046);国防技术基础(No.JSJL2018210C003)。

摘　　要：研究了BBO非线性晶体温度变化对自发参量下转换相关光子输出角度和转换效率的影响,以此获取BBO非线性晶体适宜的工作温度,从而降低温度对系统长期稳定性的影响.根据实验需求设计晶体夹持和温控系统,通过ANSYS热分析保证系统的可行性和可靠性.之后改变晶体加热温度,在温控精度不低于±0.03℃条件下测量相关光子输出角度和不同光束质量下光子数率随温度变化曲线.结果表明随着晶体温度的升高,相关光子输出角度随温度增加呈正比例减小趋势,该结果与理论计算结果相符.同时晶体从25℃升温至55℃可提高较差光束质量光子数率约34%,55℃以后,温度增长在较小比例提高光子数率的同时会极大的提高测量的背景噪声.综合可知,BBO晶体在工作过程中使用温度以55℃为宜.The effect of temperature change of BBO nonlinear crystal on the photon output angle and conversion efficiency of spontaneous parametric down-conversion is studied,so as to obtain the appropriate operating temperature of BBO nonlinear crystal and reduce the influence of temperature on the long-term stability of the system.The crystal clamping and temperature control system is designed according to the experimental requirements,and the feasibility and reliability of the system are guaranteed by ANSYS thermal analysis.After that,by changing the crystal heating temperature,the relevant photon output angle and the change curve of photon number rate with temperature under different beam masses were measured under the temperature control accuracy of no less than±0.03℃.The results show that with the increase of crystal temperature,the output angle of relevant photon decreases proportionally with the change of temperature,which is consistent with the theoretical calculation results.Meanwhile,the increase of BBO crystal temperature from 25℃to 55℃can increase the photon rate of poor beam quality by about 34%,and the subsequent temperature increase in a small range will greatly increase the background noise of measurement while increasing the photon rate.Based on the comprehensive results,it can be seen that the temperature used by BBO crystal in the working process should be 55℃.

关 键 词：BBO晶体 自发参量下转换 ANSYS热分析 输出角度 光子数率 温度 

分 类 号：O437[机械工程—光学工程]