Back to Search Start Over

In-situ determination of spin polarization in a single-beam fiber-coupled spin-exchange-relaxation-free atomic magnetometer with differential detection

Authors :
Yintao Ma
Zhixia Qiao
Yao Chen
Guoxi Luo
Mingzhi Yu
Yanbin Wang
Dejiang Lu
Libo Zhao
Ping Yang
Qijing Lin
Zhuangde Jiang
Source :
Optics Express. 31:3743
Publication Year :
2023
Publisher :
Optica Publishing Group, 2023.

Abstract

The electronic spin polarization of alkali-metal-vapor atoms is a pivotal parameter for atomic magnetometers. Herein, a novel method is presented for determining the spin polarization with a miniaturized single-beam spin-exchange-relaxation-free (SERF) magnetometer on the basis of zero-field cross-over resonance. Two separate laser beams are utilized to heat the cell and interrogate the vapor atoms, respectively. Spin polarization can be extracted by measuring the resonance response signal of the magnetometer to the transverse magnetic field under different irradiances. Results of these experiments are consistent well with the theoretical predictions with the maximum deviation less than 4%. The proposed method has the integrated advantages of possessing a simple configuration and in-situ measurement. Furthermore, combined with a homemade optical differential detection system with a factor of approximately three of the power noise suppression, the developed single-beam SERF atomic magnetometer with a measuring sensitivity of 32 fT/Hz1/2 has been achieved. This demonstrated approach can help guide the development of chip-scale atomic magnetometers for bio-magnetic field imaging applications.

Details

ISSN :
10944087
Volume :
31
Database :
OpenAIRE
Journal :
Optics Express
Accession number :
edsair.doi...........fd4bb0a46d51829dd1e5a89b606a8cd3