VCSEL frequency stabilization for optically pumped magnetometers  

作　　者：Yeguang Yan Gang Liu Haixiao Lin Kaifeng Yin Kun Wang Jixi Lu 闫业广;刘刚;林海笑;尹凯峰;王锟;陆吉玺(School of Instrumentation and Optoelectronic Engineering,Beihang University,Beijing 100191,China;Beihang Hangzhou Innovation Institute Yuhang,Hangzhou 310023,China;Research Institute for Frontier Science,Beihang University,Beijing 100191,China)

机构地区：[1]School of Instrumentation and Optoelectronic Engineering,Beihang University,Beijing 100191,China [2]Beihang Hangzhou Innovation Institute Yuhang,Hangzhou 310023,China [3]Research Institute for Frontier Science,Beihang University,Beijing 100191,China

出　　处：《Chinese Optics Letters》2021年第12期64-69,共6页中国光学快报（英文版）

基　　金：supported by the National Key R&D Program of China(No.2018YFB2002405);the National Natural Science Foundation of China(No.61903013)。

摘　　要：Optically pumped magnetometers(OPMs)have developed rapidly in the bio-magnetic measurement field,which requires lasers with stable frequency and intensity for high sensitivity.Herein we stabilize a vertical-cavity surface-emitting laser(VCSEL)without any additional setup except for the parts of an OPM.The linewidth of the absorption spectrum as a frequency reference is broadened to 40 GHz owing to pressure broadening.To enhance performance,the VCSEL injection current and temperature are tuned simultaneously using a closed-loop control system.The experiments reveal that the VCSEL frequency stability achieves 2×10^(-7) at an average time of 1 s,and the intensity noise is 1×10^(-6)V/Hz^(1/2) at 1-100 Hz.This approach is useful for suppressing OPM noise without additional sensor probe parts.

关 键 词：optically pumped magnetometer vertical-cavity surface-emitting laser single-closed-loop double-closed-loop 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]