Zero field optically pumped magnetometer with independent dual-mode operation  

作　　者：Shaowen Zhang Jixi Lu Ying Zhou Fei Lu Kaifeng Yin Di Zhan Yueyang Zhai Mao Ye 张少文;陆吉玺;周莹;逯斐;尹凯峰;詹迪;翟跃阳;叶茂(School of Instrumentation and Optoelectronic Engineering,Beihang University,Beijing 100191,China;Hangzhou Innovation Institute of Beihang University,Hangzhou 310051,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]Hangzhou Innovation Institute of Beihang University,Hangzhou 310051,China [3]Beihang Hangzhou Innovation Institute Yuhang,Hangzhou 310023,China [4]Research Institute for Frontier Science,Beihang University,Beijing 100191,China

出　　处：《Chinese Optics Letters》2022年第8期18-23,共6页中国光学快报（英文版）

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

摘　　要：We propose a dual-mode optically pumped magnetometer(OPM)that can flexibly switch between single-beam modulation mode and double-beam DC mode.Based on a 4 mm×4 mm×4 mm miniaturized vapor cell,the double-beam DC mode achieves a sensitivity of 7 fT=Hz^(1/2) with probe noise below 4 fT=Hz^(1/2) and working bandwidth over 65 Hz.This mode is designed to precisely measure the noise floor of a mu-metal magnetic shield.The single-beam modulation mode(sensitivity 20 fT=Hz^(1/2))exhibits bandwidth characteristics suitable for biomagnetic measurements.Thus,our design is suitable for a miniaturized OPM with multiple functions,including magnetic-shield background noise measurement and medical imaging.

关 键 词：optically pumped magnetometer atomic optics dual-mode magnetometer MAGNETOENCEPHALOGRAPHY medical imaging 

分 类 号：TM936[电气工程—电力电子与电力传动]