A Room‐Temperature Operational Alignment Magnetometer Utilizing Free‐Spin Precession
Ge Jin, Tao Shi, Yan Zhao, Hong Zhang, Sheng Zou
Abstract
Abstract An 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 ). With a static magnetic field amplitude of 48.5 (in proximity to Earth's magnetic field), the noise level is ).