调制转移光谱对激光频率起伏分辨率的影响因素分析及优化方法  

The influence factors and optimization of modulation transfer spectroscopy for laser frequency discrimination

作　　者：王越伟 卢飞飞 侯晓凯 王军民[1,2] Wang Yue-wei;LU Fei-fei;HOU Xiao-kai;Wang Jun-min(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,the Ministry of Education and Shanxi Province,Shanxi University,Taiyuan 030006,China)

机构地区：[1]量子光学与光量子器件国家重点实验室,山西大学光电研究所,山西太原030006 [2]教育部-山西省-省部共建极端光学协同创新中心,山西大学,山西太原030006

出　　处：《中国光学（中英文）》2024年第4期801-809,共9页Chinese Optics

基　　金：国家重点研发计划(No.2021YFA1402002);国家自然科学基金面上项目(No.11974226)。

摘　　要：采用电光位相调制器对泵浦光进行位相调制,得到射频调制转移光谱(MTS),并研究MTS光谱的类色散信号中心过零点斜率优化问题。通过改变泵浦光的调制频率,泵浦光与探测光的光斑大小,研究MTS光谱信号过零点斜率与二者之间的参数依赖关系,在泵浦光调制频率为~3.6 MHz(大约是自然线宽的0.69倍)时,得到最佳的MTS光谱信号。最后利用最优的MTS光谱将DL Pro@852 nm激光频率锁定到铯原子D2线(F=4)-(F=5’)循环跃迁,在60 min采样时间内激光频率起伏约为170 kHz,与自由运转时激光器~11 MHz的频率起伏相比,频率起伏得到了显著改善。We use an electro-optical potential phase modulator to modulate the pump light to obtain radio fre-quency modulation transfer spectroscopy(MTS),and study the optimization problem of the zero-crossing slope of the center of the dispersive signal of the MTS spectrum.By changing the modulation frequency of the pump light,the spot size of the pump light and the probe light,we study the parameter dependence between the zero-crossing slope of the MTS spectral signal and the modulation frequency,and spot size.The optimal MTS spectral signal is obtained when the pump light modulation frequency is-3.6 MHz(about 0.69 times the natural linewidth).Finally,by using the optimal MTS spectrum,the DL Pro@852 nm laser frequency is locked to the cesium atom D2 line(F=4)-(F=5')cycle transition,and the laser frequency fluctuation is about 170 kHz in the 60 minutes sampling time,which is significantly improved compared with the frequency fluctuation of the laser-11 MHz during free running.

关 键 词：调制转移光谱 激光频率鉴别 激光频率稳定 铯原子D2线 循环跃迁 电光位相调制 

分 类 号：O433[机械工程—光学工程]