All-optical single-species cesium atomic comagnetometer with optical free induction decay detection.

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. [ABSTRACT FROM AUTHOR]