High-precision alkali-atom density measurement and control methods using light absorption for dual-beam SERF magnetometers  

作　　者：刘子傲 陆吉玺 胡朝晖 李晓昱 闫一凡 詹迪 李建利 Ziao Liu;Jixi Lu;Zhaohui Hu;Xiaoyu Li;Yifan Yan;Di Zhan;Jianli Li(Key Laboratory of Ultra-Weak Magnetic Field Measurement Technology,Ministry of Education,School of Instrumentation and Optoelectronic Engineering,Beihang University,Beijing 100191,China;Zhejiang Provincial Key Laboratory of Ultra-Weak Magnetic-Field Space and Applied Technology,Hangzhou Innovation Institute,Beihang University,Hangzhou 310051,China;Hefei National Laboratory,Hefei 230088,China;Shen Yuan Honors College,Beihang University,Beijing 100191,China)

机构地区：[1]Key Laboratory of Ultra-Weak Magnetic Field Measurement Technology,Ministry of Education,School of Instrumentation and Optoelectronic Engineering,Beihang University,Beijing 100191,China [2]Zhejiang Provincial Key Laboratory of Ultra-Weak Magnetic-Field Space and Applied Technology,Hangzhou Innovation Institute,Beihang University,Hangzhou 310051,China [3]Hefei National Laboratory,Hefei 230088,China [4]Shen Yuan Honors College,Beihang University,Beijing 100191,China

出　　处：《Chinese Optics Letters》2024年第5期41-46,共6页中国光学快报（英文版）

摘　　要：The alkali-atom density measurement method based on light absorption is highly suitable for a spin-exchange relaxationfree(SERF)atomic magnetometer because of its high-precision measurement and complete nonmagnetic interference.In this study,the optical rotation angle detection system based on polarization balance detection is utilized to realize the alkali-atom density real-time measurement without affecting magnetic field measurement.We discovered that there exists an optimal frequency detuning of the probe light,which offers the highest sensitivity in alkali-atom density measurement and the lowest susceptibility to temperature fluctuations in terms of the scale factor.In contrast to conventional light absorption measurements based on pump light,this method demonstrated a threefold improvement in alkali-atom density measurement sensitivity while remaining immune to ambient magnetic fields and incident light intensity fluctuations.Furthermore,we utilized this method to achieve closed-loop temperature control with an accuracy of 0.04℃.

关 键 词：light absorption temperature measurement and control dual-beam SERF magnetometer 

分 类 号：TM936[电气工程—电力电子与电力传动]