冷原子重力仪单激光器系统倍频方法  

Method of single-laser system based on frequency doubling for cold atom gravimeter

作　　者：王杰英 孔德龙 裴栋梁 王建龙 刘为任[1,2] 赵小明 WANG Jieying;KONG Delong;PEI Dongliang;WANG Jianlong;LIU Weiren;ZHAO Xiaoming(Tianjin Navigation Instrument Research Institute,Tianjin 300131,China;Maritime Support and Technology Laboratory of China State Shipbuilding Corporation,Tianjin 300131,China)

机构地区：[1]天津航海仪器研究所,天津300131 [2]中国船舶集团有限公司航海保障技术实验室,天津300131

出　　处：《中国惯性技术学报》2021年第6期815-820,共6页Journal of Chinese Inertial Technology

基　　金：装备预研船舶重工联合重大基金项目(6141B041101-06);天津市智能制造资金支持项目(2019050)。

摘　　要：针对原子干涉重力仪野外测量需求,提出一种基于单激光器系统倍频方法的高稳定、小型化激光系统方案。首先,分析了冷原子重力仪激光倍频原理;然后,以单台1560.4 nm光纤外腔激光器作为光源,基于激光倍频技术,设计了用于^(87)Rb原子干涉重力仪的高稳定、小型化激光系统方案;最后,测试了用于重力测量的两路激光输出光束的功率稳定性。实验结果表明当780.2 nm激光输出功率为1.1 W和1.9 W时,对应功率均方根起伏分别为0.13%@4 h和0.15%@4 h,两路均可输出功率稳定、模式优良的780.2 nm激光,该系统可实现T=70 ms干涉测量,对应噪声灵敏度为610μGal/√Hz。使用倍频方法的单激光器系统,实现了传统双激光器系统功能,具有高稳定、小型化特点,为原子干涉重力仪野外测量提供了技术基础。For outfield measurement of atomic interference gravimeter,a highly stable and miniaturized scheme based on frequency-doubling method of single laser system is proposed.Firstly,the principle of laser frequency-doubling of cold atom gravimeter is analyzed.Then,based on the frequency-doubling technique,a compact and robust laser system used for the ^(87) Rb atom interference gravimeter is realized,which originate from a 1560.4 nm fiber external cavity laser.Finally,The power stability of the two output 780.2 nm laser beams used for gravity measurement are tested.When the 780.2 nm output power are 1 W and 1.9 W,the corresponding root-mean-square fluctuation are 0.13%and 0.15%for 4 hours,respectively.The detailed experiments show that both of the two output lasers have very good power stability and beam quality.Using this compact optical scheme,the atomic gravimeter can achieve interference with T=70 ms,corresponding to an acceleration sensitivity of 610μGal/√Hz.The single laser system using the frequency-doubling method realizes the function of the traditional double laser system,which has the characteristics of high stability and compact,and provides the technical basis for the outfield measurement of atomic interference gravimeter.

关 键 词：重力仪 激光系统 非线性倍频 780 nm激光 

分 类 号：P223[天文地球—大地测量学与测量工程]