Suppression of Low-Frequency Magnetic Drift Based on Magnetic Field Sensitivity in K-Rb-21Ne Atomic Spin Comagnetometer

A spin-exchange relaxation-free comagnetometer is a promising high-precision gyroscope as its inertial measurement sensitivity can rival that of existing technologies. The magnetic field error is one of the main factors that limits the long-term stability of the comagnetometer. The steady-state response and frequency response models of a K-Rb-Ne-21 comagnetometer are modified by considering the spin-exchange rate between the electron spins and the nuclear spins. The modified models are used to redefine the bias magnetic sensitivity of the K-Rb-Ne-21 comagnetometer and the suppression method of low-frequency magnetic field error is proposed. We demonstrate the magnetic drift suppression method proposed in the article by optimizing the cell temperature and pump laser power density. This study is helpful to improve the rotation measurement performance of the K-Rb-Ne-21 comagnetometer.

Automated summary

The spin-exchange relaxation-free comagnetometer is a promising high-precision gyroscope, with its long-term stability limited by magnetic field error. By modifying models based on spin-exchange rates, redefining bias magnetic sensitivity, and proposing methods to suppress low-frequency magnetic field errors, the rotation measurement performance of the comagnetometer can be improved.