超稳激光技术及其在锶光钟研究中的实现

Ultra-Stable Laser Technology and its Realization in Strontium Optical Lattice Clock

中国计量科学研究院于2008年、2011年和2018年先后研制了百赫兹、赫兹和亚赫兹量级的超稳激光系统。本文主要介绍各种指标的超稳激光实现的途径及条件,论述参考腔、快速反馈锁定技术及如何运用精密控制技术抑制外界环境对参考腔腔长的影响,获得10−15或更高频率稳定度的超稳激光。从实验上将半导体激光器稳定锁定到30 cm长的高精细度ULE参考腔上,实现了频率稳定度3×10−16的超稳激光。

National Institute of Metrology(NIM)has realized the ultra-stable laser systems of hundred Hz,Hz and sub Hz magnitudes in 2008,2011,and 2018.This paper focuses on the methods and conditions for the realization of ultra-stable lasers of various indices,discusses the reference cavity,fast feedback locking technique,and precision control technique to suppress the influence of external environment on the length of the reference cavity,and obtain 10−15 or higher frequency stability of the ultra-stable laser.Experimentally,an external cavity diode laser(ECDL)is locked to the 30-cm-long highfinesse ULE reference cavity,and the frequency stability of 3×10−16 is achieved.