北京航空航天大学学报 ›› 2018, Vol. 44 ›› Issue (8): 1727-1732.doi: 10.13700/j.bh.1001-5965.2017.0644

• 论文 • 上一篇    下一篇

快速精确调节稳频点的远共振线激光稳频方法

房子善1,2, 全伟1,2, 翟跃阳1,2   

  1. 1. 北京航空航天大学 惯性技术重点实验室, 北京 100083;
    2. 北京航空航天大学 新型惯性仪表与导航系统技术国防重点学科实验室, 北京 100083
  • 收稿日期:2017-10-23 修回日期:2017-12-01 出版日期:2018-08-20 发布日期:2018-08-29
  • 通讯作者: 全伟 E-mail:quanwei@buaa.edu.cn
  • 作者简介:房子善,男,硕士研究生。主要研究方向:精密仪器与量子传感技术;全伟,男,博士,教授,博士生导师。主要研究方向:精密仪器与量子传感技术;翟跃阳,男,博士,副教授,博士生导师。主要研究方向:精密仪器与量子传感技术。
  • 基金资助:
    国家自然科学基金(61227902,61374210,61673041,61473268,61503353)

Off-resonance laser frequency stabilization method for fast and accurate adjustment of frequency lock points

FANG Zishan1,2, QUAN Wei1,2, ZHAI Yueyang1,2   

  1. 1. Science and Technology on Inertial Laboratory, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
    2. Fundamental Science on Novel Inertial Instrument & Navigation System Technology Laboratory, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2017-10-23 Revised:2017-12-01 Online:2018-08-20 Published:2018-08-29
  • Supported by:
    National Natural Science Foundation of China (61227902, 61374210, 61673041, 61473268, 61503353)

摘要: 原子磁强计、激光冷却等技术需要将激光频率稳定在远离原子跃迁频率几兆赫兹的大失谐处,法拉第旋光光谱稳频方法能够实现远共振线的大失谐处的稳频,但是存在稳频点调节不便的问题。在法拉第旋光光谱稳频方法的基础上进行改进,提出了一种快速精确调节稳频点的远共振线激光稳频方法,能够在几十至几百兆赫兹范围内对稳频点频率进行快速精确的调节。基于该方法使失谐为-6.2 GHz的稳频点精确频移130 MHz,并实现频率漂移3.3 MHz/h,波动均方根值0.6 MHz/h的激光频率稳定度,满足原子磁强计对失谐及频率稳定性的要求。另外,分析了温度对该稳频方法的影响,推导了预估稳频点频率的物理参数,并将温度调节和声光调制器(AOM)调节相结合,以更好地实现在远共振线大失谐处对激光频率的长期稳定和精确控制。

关键词: 半导体激光器, 激光稳频技术, 激光光谱, 原子光谱, 法拉第旋光

Abstract: The atomic magnetometer and Raman cooling need to lock the frequency of the laser on the detuning of several gigahertz away from the resonance. The laser frequency stabilization technique in Faraday rotation spectroscopy can stabilize the laser frequency on the large detuning away from the resonance. But, in this method, changing the frequency lock points can be complex and has high latency. We present a far off-resonance laser frequency stabilization method that can fast and accurately adjust the frequency lock points in the range of tens to hundreds of megahertz based on the Faraday rotation spectroscopy. Based on this method, the frequency lock point whose detuning is -6.2 GHz is precisely shifted by 130 MHz, and we obtain a frequency drift of 3.3 MHz/h and a root mean square fluctuation of 0.6 MHz/h. This satisfies the detuning and frequency stability requirements of atomic magnetometer. In this paper, the influence of temperature on the frequency stabilization method is analyzed, the physical constant in the detuning equation is measured to estimate the frequency of the stabilization point, and the temperature regulation and acousto-optic modulator (AOM) regulation are combined to improve the long-term stable and precise control of the laser frequency on the large detuning of off-resonance.

Key words: diode laser, laser frequency stabilization technology, laser spectroscopy, atomic spectroscopy, Faraday rotation

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