基于调制转移光谱多参量相关的激光稳频特性研究  

Research on Frequency Stabilization Characteristics of Multi-parameter Dependent Laser Source Based on Modulated Transfer Spectrum

作　　者：宋微 朱欣欣 吴彬[1] 王河林[1] 林强[1] SONG Wei;ZHU Xinxin;WU Bin;WANG Helin;LIN Qiang(Center for Optics and Optoelectronics Research,College of Science,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]浙江工业大学理学院量子精密测量重点实验室,杭州310023

出　　处：《光子学报》2021年第11期63-71,共9页Acta Photonica Sinica

基　　金：国家重点研发计划(Nos.2016YFF0200206,2017YFC0601602);国家自然科学基金(Nos.61727821,61475139,61478069,11604296,11404286,51905482);中国自然资源航空物探遥感中心项目(No.DD20189831);浙江省新苗人才计划(No.2021R403093)。

摘　　要：基于调制转移光谱技术实现了分布式反馈半导体激光器在87RbD2线F=2→F΄=3上的频率锁定,并理论和实验研究了调制频率、解调相位、泵浦光偏振和磁场等多参量对调制转移光谱信号幅值、过零点斜率的影响,为选择和优化调制转移光谱稳频技术提供依据。研究表明,当泵浦光调制频率位于9~15 MHz,调节信号相位改变量在π/5附近时,可获得最佳的锁频信号。实验中,当调制频率为12.5 MHz,泵浦光与探测光偏振角为90o,外加磁场为5 Gs时,通过优化解调信号相位和比例积分微分控制参数,使调制转移光谱信号幅值及过零点斜率达到最佳,实现了分布式反馈半导体激光器的高精度频率锁定。锁频后的激光线宽约为1.6 MHz,频率稳定度小于1.75×10-9,该锁频激光系统可用作冷原子干涉的光源。Based on the modulation transfer spectroscopy technique,the frequency locking of the distributed feed back laser on the ^(87)RbD2 line F=2→F΄=3 is realized,and the multi-parameter pairs such as modulation frequency,demodulation phase and pump light polarization are theoretically and experimentally studied.Modulating the effects of the shifted spectral signal provides a basis for selecting and optimizing the modulation transfer spectral stabilization technique.The results show that the best frequency locking signal can be obtained when the pump modulation frequency is between 9~15 MHz and the phase change of the modulation signal is nearπ/5.In the experiment,when the modulation frequency is 12.5 MHz,the polarization angle of pump and probe light is 90o,and the applied magnetic field is 5 Gs,the amplitude and zero slope of modulation transfer spectroscopy signal are optimized by optimizing the demodulation signal phase and proportion,integral,differential control parameters,and the high-precision frequency locking of DFB laser is realized.The frequency line after the frequency-locked laser is about 1.6 MHz,and the frequency stability is less than 1.75×10^(-9),it can be used as a light source in the cold atom interference experiment.

关 键 词：调制转移光谱 铷 分布式反馈半导体激光器 激光稳频 激光线宽 

分 类 号：O433.54[机械工程—光学工程]