原子干涉重力测量系统激光频率溯源研究  

Research on Laser Frequency Tracing of Atomic Interference Gravimeter

作　　者：庄伟[1] 曹士英[1] 王少凯[1] 赵阳[1] 房芳[1] 李天初[1] ZHUANG Wei;CAO Shiying;WANG Shaokai;ZHAO Yang;FANG Fang;LI Tianchu(National Institute of Metrology,,Beijing 100029,China)

机构地区：[1]中国计量科学研究院,北京100029

出　　处：《计量科学与技术》2020年第11期68-72,共5页Metrology Science and Technology

基　　金：国家重点研发计划项目(2016YFF0200206);国家自然科学基金青年基金资助项目(11704361)。

摘　　要：原子干涉重力测量系统的激光频率需要精确测量。采用1560nm激光,其频率锁定在飞秒光梳的梳齿频率上,经过光纤传递至铷原子干涉重力测量系统端,通过倍频产生780nm与待测激光拍频,实现激光频率测量。该方案可以实现远距离测量激光频率,具有更高的信噪比,通过北斗伺服铷钟作为频率参考,激光频率测量扩展不确定度达到1.3×10^-12(k=2),完全满足原子干涉重力测量系统的需求。Precise measurement of laser frequency is crucial for the atomic gravimeter.In this research,we adopt a1560 nm laser,where the frequency is locked to a femtosecond optical comb.The 1560 nm laser is transferred to the Rb atomic gravimeter port through an optical fiber,and the 780 nm laser is generated by the second harmonic process,which is used to beat with the laser of the gravimeter to measure laser frequency.The scheme can achieve remote measurement with a higher signal to noise ratio.The measurement uncertainty reaches 1.1×10^-12 using the onboard Beidou Rb atomic clock as a frequency reference,which fully meets the requirement of the atomic interference gravimeter.

关 键 词：原子重力测量 激光频率 飞秒光梳 铷钟 激光倍频 频率锁定 

分 类 号：TH761.5[机械工程—仪器科学与技术] TN24[机械工程—精密仪器及机械]