Automatic magnetic compensation system for SERF atomic comagnetometer

To realize the SERF (spin exchange relaxation free) state of the atomic comagnetometer for inertial measurement, this paper proposes an efficient automatic magnetic compensation system based on the analysis of the dynamic model of the SERF atomic comagnetometer, such that the essential and necessary condition of low environmental magnetic field is satisfied. This system first makes a fast but rough compensation to reduce the impact of environmental magnetic field to a very low level, then accurately but slowly compensates the residual magnetic field. The rough compensation is made under low power detection light to achieve high efficiency, while the accurate one is made under high power detection light to achieve high accuracy, which are both automatically performed. This is definitely an advantage over the most existing magnetic compensation systems for the SERF atomic comagnetometer, which rely only on manual adjustments with low accuracy and poor repeatability. The simulation illustrates the good efficiency, accuracy and repeatability of the proposed automatic magnetic compensation system.