Real-time electronic longitudinal polarizability closed-loop control method in SERF atomic comagnetometer

The electron spin's fluctuation in longitudinal polarizability significantly compromises the long-term stability of inertial measurement systems. Here introduces a real-time closed-loop control method for electron spin polarizability, employing magnetic field modulation, and thoroughly analyzes the system's output responsiveness to changes in electron polarizability. By applying modulated magnetic field, the electron's longitudinal polarizability information is derived from the output signal. Subsequently, stable control of this polarizability is achieved by adjusting the intensity of the Pump optical power density. Experimental results have validated that this new method significantly improves inertial measurement sensitivity. This method is also suitable for the research of optical pump magnetometer and nuclear magnetic resonance comagnetometer.