Abstract

We propose and experimentally demonstrate an atomic spin precession detection technique using a modified reflective closed-loop fiber-optic Saganc interferometer with circularly polarized light. Preliminary tests for the measurements of magnetic field and rotation rate based on the polarized K-Rb-²¹Ne comagnetometer achieve a magnetic field sensitivity of 1.2 pT/Hz^1/2 and a rotation sensitivity about 1.65×10⁻⁵ rad/s/Hz^1/2, respectively. The nonlinear response of the atomic gyroscope is also investigated.

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