A method and device for detecting atomic spin precession based on circularly polarized probe light

Abstract

The invention discloses a method and device for detecting atomic spin precession based on circularly polarized probe light. The method is based on the optical rotation characteristics of polarized atoms in an atomic gas chamber, adopts a birefringent optical path to form left and right circularly polarized light, and converts left and right circularly polarized light to Incident to the atomic gas cell, the phase difference between the left and right circularly polarized light passing through the gas cell is proportional to the precession of the atomic spin, and the reflector is used to return the outgoing circularly polarized light to the original path, and the two circularly polarized left and right handedness are exchanged, and the phase difference Doubled, using circularly polarized light interference technology to interfere with left and right circularly polarized light, to achieve phase difference measurement and high-sensitivity detection of atomic spin precession. The invention designs a reflective optical fiber circular polarization interferometer device based on a polarization-maintaining optical fiber to realize atomic spin precession detection. The invention realizes atomic spin precession detection, has high precision and sensitivity, strong anti-interference ability and small volume. A practical detection method and device with ultra-high sensitivity and ultra-high precision are provided for the atomic spin sensor based on the measurement of atomic spin precession.

Description

technical field [0001] The invention relates to an atomic spin precession detection method and device based on circularly polarized detection light, belonging to the field of atomic manipulation and atomic state detection. Background technique [0002] Since the late 1990s, atomic spin devices with atomic spin as the sensitive core have developed rapidly, and have continuously innovated the development of cutting-edge physics research, people's livelihood, military defense and other fields. Spin is an intrinsic property of atoms. For atomic ensembles, atomic spin has angular momentum, which is the vector synthesis of electron spin angular momentum, orbital angular momentum and nuclear spin angular momentum. It has space in inertial space Fixed axis, so it can be equivalent to a high-speed rotor in a rotor gyroscope to achieve inertial measurement; when there is a magnetic field outside, the atomic spin will undergo Larmor precession, and the magnetic field measurement can al...

AI Technical Summary

Problems solved by technology

However, the high requirements on the stability of the light source and the environment limit the further improvement of the system precision, especially on the premise of ensuring the high sensitivity of the atomic spin device, it is necessary to improve the new system to maintain the long-term stability of the system and improve the integration level. ideas and new methods

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