基于铷原子调制转移光谱技术的1560nm光纤激光器频率锁定研究  

Research on Frequency Locking of 1560 nm Fiber Laser Based on Rubidium Atomic Modulation Transfer Spectroscopy Technology

作　　者：喻晓 吕梦洁 张旭 贾爱爱 王国超 朱凌晓 颜树华[1,2] 杨俊[1,2] Yu Xiao;LüMengjie;Zhang Xu;Jia Aiai;Wang Guochao;Zhu Lingxiao;Yan Shuhua;Yang Jun(College of Intelligence Science and Technology,National University of Defense Techiiology,Changsha,Hunan 410073,China;Interdisciplinary Center for Quantum Information,National University of Defense TecJmology,Changsha,Hunan 410073,China;Laser Fusion Research Center,China Academy of Engineering Physics,Mianyang,Sichuan 622150,China;Rocket Force University of Engineering,Xi'an,Shaanxi 710025,China)

机构地区：[1]国防科技大学智能科学学院,湖南长沙410073 [2]国防科技大学量子信息学科交叉中心,湖南长沙410073 [3]中国工程物理研究院激光聚变研究中心,四川绵阳622150 [4]火箭军工程大学,陕西西安710025

出　　处：《中国激光》2022年第3期9-17,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(12004428);湖南省自然科学基金优秀青年项目(2021JJ20047);湖南省自然科学基金(2021JJ30774);中国博士后科学基金资助项目(2020M683729)。

摘　　要：1560 nm窄线宽激光器作为光学C波段的重要波长成分,在光纤传感和激光雷达等领域有着广泛的应用,实现该波段的激光稳频对光谱学和精密测量具有重要意义。本文采用1560 nm窄线宽光纤激光器作为种子光源,倍频至780 nm波段后,利用调制转移光谱(MTS)将倍频光锁定在铷原子(^(85)Rb)D2线的3-4交叉峰上;并研究探测光和泵浦光功率比、调制解调信号的频率和幅值来优化MTS信号,最终同时实现1560 nm光纤激光器的频率锁定及780 nm的稳频输出。激光器稳频后与低噪声精密锁定的光学频率梳进行拍频,通过频率计测量拍频信号并进行Allan方差分析,积分时间为10 s时,相对频率稳定度为1.4×10^(-11)。Objective C-band(1530-1565 nm)lasers are widely used in the field of optical fiber communication because of their extremely low energy loss in optical fibers.In addition,fiber lasers have the advantages of narrow line width,small size and simple structure and have important application values in various fields such as optical sensing,lidar and quantum communications.These applications require a narrow laser linewidth and a stable laser frequency,especially under precise measurement conditions.The realisation of laser frequency stabilisation in this band is of great significance in spectroscopy and precision measurement.In addition to the frequency stabilisation of C-band lasers directly through molecular absorption lines such as acetylene(C_(2)H_(2)),ammonia(NH3)and hydrogen cyanide(HCN),another method is to convert C-band lasers to visible-light bands and then use some classic atomic-transition spectral lines for frequency stabilisation.However,in the field of quantum precision measurement,commercial semiconductor lasers in the visible-light band are currently mainly used for quantum control.These seed light sources have a wide line width and generally require line width compression when used.By combining the C-band narrow line width laser technology with the frequency doubling and frequency technology of high conversion efficiency nonlinear crystals,high-power narrow-linewidth lasers with a variety of visible wavelengths can be realized,which is expected to replace semiconductor lasers in the fields of atomic and molecular physics and quantum information technology.Methods We investigated and compared the advantages and disadvantages of different frequency stabilisation methods and determined our experimental programme.Unlike previous reports that directly use a 780 nm semiconductor laser to stabilise the frequency and use a 1560 nm semiconductor laser to amplify and double the frequency,this study uses a 1560 nm narrow linewidth,Piezoelectric Transducer(PZT)cavity-tuning fiber laser as the seed light source,an

关 键 词：激光器 光纤光学 光纤激光器 调制转移光谱 铷原子 频率锁定 频率稳定度 

分 类 号：O436[机械工程—光学工程]