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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

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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509 nm倍频激光器的无调制频率锁定。我们在实验中使用852 nm激光和509 nm激光在铯原子蒸汽池中构成阶梯型三能级体系,852 nm激光器的频率锁定在铯原子6S1/2→6P3/2共振跃迁线上,509 nm激光在铯原子激发态6P3/2→62D5/2 Rydberg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852 nm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509 nm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533 kHz,最小阿伦方差达到15×10-11。

Abstract

We present the laser frequency stabilization of the 509 nm frequency double laser using electromagnetically induced transparency spectra,which is appeared from a cascade three-level system based the Rydberg atom.The 852 nm laser and 509 nm laser compose the cascade three-level scheme.The frequency of 852 nm laser is locked on the 6S1/2(F=4)→6P3/2(F′=5) transition line of the cesium atom.While 509 nm 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 852 nm 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 533 kHz and the minimum Allan variance of 400 s measure time is 15×10-11.

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中图分类号:O562.3

DOI:10.3788/jqo20182404.0403

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

收稿日期:2018-06-15

修改稿日期:2018-07-23

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陈肖含: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极端光学协同创新中心,山西 太原 030006
师雪荣: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极端光学协同创新中心,山西 太原 030006
贾玥: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极端光学协同创新中心,山西 太原 030006
张临杰: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极端光学协同创新中心,山西 太原 030006
李卫东:山西大学 物理电子工程学院,山西 太原 030006
肖连团: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极端光学协同创新中心,山西 太原 030006

联系人作者:陈肖含(1063010672@qq.com)

备注:陈肖含(1995-), 男, 山西汾阳人, 硕士研究生, 主要从事里德堡原子精密测量方面的研究。

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引用该论文

CHEN Xiao-han,SHI Xue-rong,JIA Yue,ZHANG Lin-jie,LI Wei-dong,XIAO Lian-tuan. Laser Frequency Locking based on EIT Spectra of Rydberg Atom[J]. Acta Sinica Quantum Optica, 2018, 24(4): 430-435

陈肖含,师雪荣,贾玥,张临杰,李卫东,肖连团. 基于Rydberg原子EIT光谱的激光频率锁定[J]. 量子光学学报, 2018, 24(4): 430-435

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