Abstract
We propose an in-situ method to calibrate the coil constants of the optical atomic magnetometer. This method is based on measuring the Larmor precession of spin polarized alkali metal atoms and has been demonstrated on a K-Rb hybrid atomic magnetometer. Oscillation fields of different frequencies are swept on the transverse coil. By extracting the resonance frequency through phase-frequency analysis of electron spin projection, the coil constants are calibrated to be 323.1 ± 0.28 nT/mA, 108 ± 0.04 nT/Ma, and 185.8 ± 1.03 nT/mA along the X, Y, and Z directions, respectively.
Highlights
Atomic magnetometer, with the rapid development of recent decades [1,2,3], has been reported as the most sensitive known magnetic measurement instrument
One set of triaxial magnetic coil system is required in the magnetometer to supply direct current (DC) or alternating current (AC) field
The residual magnetic field cannot be adequately compensated without accurate coil constants
Summary
With the rapid development of recent decades [1,2,3], has been reported as the most sensitive known magnetic measurement instrument. The residual magnetic field cannot be adequately compensated without accurate coil constants. Apart from these, accurate coil constants decide the direct readout of the atomic magnetometers working in the close-loop mode.
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