Affiliation:
1. School of Instrument Science and Opto‐Electronics 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
Abstract
AbstractAn alignment magnetometer based on free‐spin precession (FSP) has been deployed in the geomagnetic range. A linearly polarized probe beam is utilized to create alignment in a buffer‐gas‐free paraffin‐coated natural abundance rubidium vapor cell at room temperature exposed to a pulsed radio frequency field. Furthermore, the utilization of hyperfine‐selective optical repumping employing linearly polarized beams amplifies the proportion of responsive atoms. As a consequence, this leads to a remarkable enhancement in the optical rotation signal. This paper reports measurements with a minor static magnetic field of about 1 inside a four‐layer ‐metal shield, achieving a system noise level of 0.16 )−1. With a static magnetic field amplitude of 48.5 (in proximity to Earth's magnetic field), the noise level is ≈0.75 )−1.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Beijing Municipality
Subject
Electrical and Electronic Engineering,Computational Theory and Mathematics,Condensed Matter Physics,Mathematical Physics,Nuclear and High Energy Physics,Electronic, Optical and Magnetic Materials,Statistical and Nonlinear Physics