Atomic comagnetometers, which measure the spin precession frequencies of overlapped species simultaneously, are widely applied to search for exotic spin-dependent interactions. Here we propose and implement an all-optical single-species Cs atomic comagnetometer based on the optical free induction decay (FID) signal of Cs atoms in hyperfine levels \(F_{g}\) = 3 and 4 within the same atomic ensemble. We experimentally show that systematic errors induced by magnetic field gradients and pump light are highly suppressed in the comagnetometer. With further optimization, the single-species comagnetometer has the potential to be applied in searches for exotic spin-dependent interactions.

同时测量重叠物种自旋进动频率的原子电磁仪被广泛用于寻找与外在自旋有关的相互作用。在此，我们基于 同一原子系内超精细水平\（F_ {g} \） = 3和4的Cs原子的光自由感应衰变（FID）信号，提出并实现了一种全光学单物种Cs原子电磁仪。我们的实验表明，在磁场仪中，由磁场梯度和泵浦光引起的系统误差得到了高度抑制。通过进一步优化，单物种电磁仪有可能被用于寻找与外来自旋相关的相互作用。