光学学报, 2020, 40 (22): 2214002, 网络出版: 2020-10-25   

可搬运铷喷泉原子钟全自动激光稳频系统 下载: 1091次

Automatic Laser Frequency Stabilization System for Transportable 87Rb Fountain Clock
作者单位
1 中国科学院上海光学精密机械研究所量子光学重点实验室, 上海 201800
2 中国科学院大学, 北京 100049
摘要
能够长期自主运行的稳频激光器是喷泉原子钟连续工作的基础。基于铷原子喷泉钟中的780 nm商用半导体激光器,利用嵌入式系统设计了一个长期全自动稳频系统。该系统具有自动识别铷饱和吸收谱线的目标峰、长期锁定频率与意外失锁后的快速重锁的功能。提出了一种动态调整工作点的方法。在激光器长期运行过程中,受温度、湿度和器件老化等因素的影响,目标工作点会随时间发生变化,所提方法可解决该问题。利用该方法,激光器的稳频系统不易失锁,即使失锁也可以快速重新锁回。将所提稳频系统成功应用于可搬运铷喷泉原子钟中,铷喷泉原子钟在搬运后能够快速投入工作,激光频率的长期锁定时间可达一个月以上。激光频率相对于铷饱和参考谱线的频率长期稳定度约为2.3×10 -13,可搬运铷喷泉原子钟的长期稳定度在搬运前后均达到了10 -16量级。
Abstract
A frequency stabilized laser capable of long-term autonomous operation is the basis for the continuous operation of an atomic fountain clock. In this paper, based on a 780 nm commercial external cavity diode laser used in the 87Rb fountain clock, we develop a long-term automatic frequency stabilization system by using an embedded system. The proposed system can automatically identify the target peak in the 87Rb saturated absorption spectrum, stabilize the laser frequency for a long time and quickly re-lock it after an accidental loss of lock. In addition, we develop a method for dynamically adjusting the operating point. The target operating point changes with time because the influences of temperature, humidity, device aging, and other factors during the long-term operation of the laser. Based on this method, the laser frequency stabilization system makes lock loss rarely occur, and easily re-locks even if lock loss happens. The proposed frequency stabilization system has been successfully applied to our transportable 87Rb fountain clock. The clock can operate normally soon after transport and the long-term stabilization time of laser frequency can reach more than one month. The long-term stability of laser frequency relative to the 87Rb saturated absorption spectrum is about 2.3×10 -13 and the long-term stability of the transportable 87Rb fountain clock before and after transport is always at the magnitude of 10 -16.

吉经纬, 程鹤楠, 张镇, 刘亢亢, 项静峰, 任伟, 李琳, 吕德胜. 可搬运铷喷泉原子钟全自动激光稳频系统[J]. 光学学报, 2020, 40(22): 2214002. Jingwei Ji, Henan Cheng, Zhen Zhang, Kangkang Liu, Jingfeng Xiang, Wei Ren, Lin Li, Desheng Lü. Automatic Laser Frequency Stabilization System for Transportable 87Rb Fountain Clock[J]. Acta Optica Sinica, 2020, 40(22): 2214002.

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