用于镱原子光钟759nm光晶格激光的频率锁定  

Frequency Locking of 759nm Lattice Laser for Ytterbium Optical Clock

作　　者：王进起 贺凌翔[1,2] WANG Jin-qi;HE Ling-xiang(State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences,Wuhan 430071;Key Laboratory of Atomic Frequency Standards,Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences,Wuhan 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China))

机构地区：[1]中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室,武汉430071 [2]中国科学院原子频率标准重点实验室,武汉430071 [3]中国科学院大学,北京100049

出　　处：《量子光学学报》2018年第4期371-376,共6页Journal of Quantum Optics

基　　金：国家自然科学基金(11574352;91536104;91636215);B类战略性先导科技专项(XDB21030100)

摘　　要：本文报道了一种用于镱原子光钟的759nm光晶格激光频率锁定方法。759nm激光通过Pound-Drever-Hall(PDH)技术锁定在一个腔长为10cm的超低膨胀系数(ULE)的高细度Fabry-Perot(FP)腔上。激光频率被锁定后的测量结果表明,759nm的光晶格激光线宽被压窄到小于200kHz;运用频率锁定的759nm激光和飞秒光梳拍频来监测超稳腔的长期漂移率,结果显示ULE超稳腔的漂移率为0.16Hz/s。将锁定后的759nm光晶格激光用于镱原子光钟光晶格的装载,实现了镱原子在光晶格场中的稳定装载以及对光晶格场频率的精确控制,从而为镱原子光钟的闭环运转做了必要的技术准备。We report a locking method of the 759nm laser for ytterbium(Yb)optical clock is realized experimentally.The 759nm laser is locked to an ultra-low expansion(ULE)cavity with the Pound-Drever-Hall (PDH)technique.After the laser is locked,the linewidth of the 759nm laser decreases to less than 200 kHz;Beating with corresponding component of the femtosecond comb,the lattice laser show an excellent long term drift behavior,with the drift rate of 0.16Hz/s.The frequency-stabilized 759nm lattice laser is used to load the cold atoms into the optical lattice for the Yb optical clock,and the cold Yb atoms is steadily trapped in the optical lattice and the frequency of the lattice laser is accurately controlled.It paves the way for the closed-loop operation of the Yb lattice clock.

关 键 词：759nm光晶格激光 ULE超稳腔 PDH稳频技术 镱原子光晶格钟 

分 类 号：O431[机械工程—光学工程]