基于Rydberg原子EIT光谱的激光频率锁定  

Laser Frequency Locking based on EIT Spectra of Rydberg Atom

作　　者：陈肖含 师雪荣 贾玥 张临杰[1,3] 李卫东 肖连团[1,3] CHEN Xiao-han;SHI Xue-rong;JIA Yue;ZHANG Lin-jie;LI Wei-dong;XIAO Lian-tuan(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,China;College of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学激光光谱研究所量子光学与光量子器件国家重点实验室,山西太原030006 [2]山西大学物理电子工程学院,山西太原030006 [3]极端光学协同创新中心,山西太原030006

出　　处：《量子光学学报》2018年第4期430-435,共6页Journal of Quantum Optics

基　　金：国家自然科学基金(91536110);国家重点研发计划课题(2016YFF0200104)

摘　　要：本文利用Rydberg阶梯型三能级系统的电磁诱导透明光谱实现了509nm倍频激光器的无调制频率锁定。我们在实验中使用852nm激光和509nm激光在铯原子蒸汽池中构成阶梯型三能级体系,852nm激光器的频率锁定在铯原子6S1/2→6P3/2共振跃迁线上,509nm激光在铯原子激发态6P3/2→62D5/2Rydberg态的跃迁频率附近扫描获得了Rydberg态的电磁诱导透明光谱。利用852nm半导体激光器的频率调制作为参考信号,对探测的电磁诱导透明光谱信号进行解调得到误差信号,实现了509nm激光器的频率锁定。通过分析误差信号的频谱,对伺服电路的低频和高频反馈参数进行优化,获得的最佳锁定线宽约为533kHz,最小阿伦方差达到1.5×10^-11。We present the laser frequency stabilization of the 509nm frequency double laser using electromagnetically induced transparency spectra,which is appeared from a cascade three-level system based the Rydberg atom.The 852nm laser and 509nm laser compose the cascade three-level scheme.The frequency of 852nm laser is locked on the 6S1/2(F=4)→6P3/2(F'=5)transition line of the cesium atom. While 509nm laser is scanned near the transition frequency of the atom excited state 6P3/2→62D5/2 Rydberg state,in order to obtain the electromagnetically induced transparency spectra of Rydberg state.The frequency modulation of 852nm semiconductor laser is used as a reference signal.The error signal, demodulated electromagnetically induced transparency spectra signal,is fed back to realize the frequency locking of 509nm laser.High and low frequency feedback parameters of the servo system are optimized by analyzing the frequency spectrum of error signal with frequency locked.The finally locking linewidth of 509nm laser is about 533kHz and the minimum Allan variance of 400s measure time is 1.5×10^-11.

关 键 词：电磁诱导透明光谱 RYDBERG态 频率锁定 

分 类 号：O562.3[理学—原子与分子物理]