Ge Jin, Tao shi, Yan Zhao, Hong Zhang, Sheng Zou

A Room‐Temperature Operational Alignment Magnetometer Utilizing Free‐Spin Precession

  • 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

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.

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