In-situ suppression of high-frequency magnetic field generated by the electric heater for atomic magnetometers

Abstract

In this study, an in-situ suppression for the high-frequency magnetic field (HFMF) generated by the electric heater based on the detection of the atomic magnetometer signal is proposed. Specifically, by modeling the response of atomic spin precession signals from an optically pumped atomic magnetometer to the HFMF, the in-situ suppression is achieved by the radio frequency fields produced by coils to compensate the HFMF. The suppression of the HFMF generated by the electric heater is judged based on the amplitude response of the spin precession signal detected at the atomic resonance. Our proposed method is validated through both simulation and experimental results. Before and after in-situ suppression of the HFMF generated by the electric heater, the sensitivity of 13000 nT and 15000 nT static magnetic field within the heating frequency band is measured, resulting in approximately 50% and 60% increases in sensitivity after suppression, respectively.