镱离子光钟的多波长数字PID激光稳频系统  

Multi-wavelength digital PID laser frequency stabilization system for ytterbium ion optical clock

作　　者：韩蕾 薛潇博 纪仟仟 苏亚北 陈煜 HAN Lei;XUE Xiaobo;JI Qianqian;SU Yabei;CHEN Yu(Beijing Institute of Radio Metrology and Measurements,Beijing 100039,China)

机构地区：[1]北京无线电计量测试研究所,北京100039

出　　处：《计测技术》2023年第3期129-135,共7页Metrology & Measurement Technology

摘　　要：针对镱离子光钟实验中激光冷却并操控离子时,激光器频率漂移影响原子钟系统的问题,基于数字PID控制方法,设计了一种新的多通道频率-数字信号转换稳频方法,将多路多波长激光频率锁定在波长计的参考频率上。对激光器锁定前和锁定后的频率进行一定时长的数据采集及数据对比,激光频率漂移由800 MHz控制在±0.8 MHz,激光频率稳定度由9.29×10^(-10)@1 s优化至2.79×10^(-10)@1 s,频率千秒稳达到3.85×10^(-12)。该系统简单、易实现,具有小型化、适应性强的优点。In the ytterbium ion optical clock experiments,the ions are cooled and manipulated by lasers,and the laser frequency shifts will affect the atomic clock system.Aiming at the laser frequency shifts,based on the digital PID control method,a new multi-channel frequency-digital signal conversion method for frequency stabilization is designed to lock the multi-channel and multi-wavelength laser frequency to the reference frequency of the wavelength meter.The laser frequency data before and after locking are acquired for a certain amount of time and compared.The result shows that the laser frequency drift is stabilized from 800 MHz to ± 0.8 MHz,the laser frequency short-term instability decreases from 9.29 × 10^(-10)@1 s to 2.79 × 10^(-10)@1 s,and the long-term instability reaches 3.85 × 10^(-12)@1 000 s.The system is simple and easy to implement,and has the advantages of miniaturization and strong adaptability.

关 键 词：镱离子光钟 稳频 数字PID 波长计 

分 类 号：TB96[机械工程—光学工程]