Maintenance of self-compensated state in a K-Rb-~(21)Ne atomic comagnetometer via manipulation of time-varying pump light and photoelectric feedback control

摘要

We theoretically develop a method for maintaining the self-compensated state of a K-Rb-~(21)Ne comagnetometer, which is one of the core problems in optimizing the detection sensitivity of the comagnetometer to fundamental interactions and inertial rotation. The result of Rb-~(21)Ne coupling dynamics under transverse cosinusoidal magnetic field modulation can present a dispersive response with respect to the varying ~(21)Ne nuclear magnetic field B~n, in which a monotonic interval can be used to monitor the drift of B~n. Furthermore, the result of Rb spin poparization evolution under the constraint of self-compensated-state maintenance exhibits a large enough time scale relative to Rb spin relaxation that it can be regarded as a quasi-static process, thus the adopted time-varying pump light intensity can be obtained using Rb equilibrium polarization. Accordingly, an implementation scheme is given. This method can not only compensate the drifting B~n, but also promote the system to return back to the original self-compensated state through manipulation of atomic polarization via time-varying pump light, which is useful in stabilizing the system performance.