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.

Automated summary

The study introduces and demonstrates an all-optical single-species Cs atomic comagnetometer, which measures the spin precession frequencies of atoms in two hyperfine levels simultaneously, with significant suppression of systematic errors induced by magnetic field gradients and pump light. The comagnetometer has the potential to be applied in searches for exotic spin-dependent interactions with further optimization.