Duan Lihong, Quan Wei, Chen Yao, Jiang Liwei, Fan Wenfeng, Ding Ming, Wang Zhuo, Fang Jiancheng
Appl Opt. 2018 Mar 1;57(7):1611-1616. doi: 10.1364/AO.57.001611.
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.
双轴原子共磁强计能够同时且独立地感测两个测量轴的角旋转。然而，由于残余磁场以及泵浦激光引起的光频移，两个轴之间存在串扰耦合效应。在此，我们提出一种消除双轴K-Rb-N₂₁e原子共磁强计旋转耦合的方案。通过在磁补偿点和磁屏蔽层处控制共磁强计，可以有效去除残余磁场。利用K原子光频移抵消Rb原子光频移可消除光频移，其中通过精细调节K D1线的泵浦激光波长将K原子光频移优化至解耦点。该解耦方案的可行性和有效性已通过实验验证。与敏感轴相比，耦合轴的输出响应降低了两个数量级。此方案还可应用于任何经历串扰耦合的混合光泵浦原子共磁强计。
