Rotation sensing decoupling of a dual-axis K-Rb-²¹Ne atomic comagnetometer

A dual-axis atomic comagnetometer can sense the angular rotation of two measurement axes simultaneously and independently. However, there is a cross-talk coupling effect between the two axes because of the residual magnetic field and the light shift arising from the pumping laser. Here, we propose a scheme to eliminate the rotation coupling of dual-axis K-Rb-N21e atomic comagnetometers. The residual magnetic field can be effectively removed by controlling the comagnetometer at the magnetic compensation point and the magnetic shielding layer. The light shift could be eliminated by using the K atom light shift to counteract the Rb atom light shift, in which the light shift of K atoms was optimized to the decoupling point by finely adjusting the pumping laser wavelength of the K D1 line. The feasibility and efficiency of this decoupling scheme have been experimentally verified. The output response of the coupling axis is reduced by two orders of magnitude compared to the sensitive axis. This scheme can also be applied to any atomic comagnetometer with hybrid optical pumping that experiences cross-talk coupling.