Optical frequency shift suppression method for a serf atomic magnetometer

Abstract

The invention relates to an optical frequency shift inhabitation method of an SERF atom magnetometer. In the normal optical frequency shift inhabitation method of an SERF atom magnetometer, the frequency of the pumping light is adjusted to be in the center of a spectral line of an atomic absorption spectrum. However, an alkali metal air chamber of the SERF atom magnetometer is characterized by high atomic density and big buffering gas pressure, so the center of the spectral line is hard to obtain. Therefore, the definition of the normal optical frequency shift inhabitation method is not high. According to the optical frequency shift inhabitation method provided by the invention, under two different pumping light strengths, by combining the three dimensional in-situ magnetic compensation technology, the size of the magnetic field sensed by atoms corresponding to the different pumping light frequencies is measured, and theoretic fitting and resolving on the measured data, so optical frequency shift null points can be precisely found, thereby achieving sufficient inhabitation of the optical frequency shift. The optical frequency shift inhabitation method provided by the invention is independent of measurement of the atomic absorption spectrum, and the optical frequency shift inhabitation level depends on the precision of the magnetic compensation, so compared with the normal method, the optical frequency shift inhabitation method provided by the invention is quite high in inhabitation precision.

Description

technical field [0001] The invention relates to a method for suppressing optical frequency shift of a SERF (Spin-Exchange-Relaxation-Free) atomic magnetometer, which belongs to the field of atomic magnetometers and can also be used in the field of atomic spin gyroscopes. Background technique [0002] Optical frequency shift is a common error in atomic magnetometers. When circularly polarized pump light acts on atoms, the ACstark effect will cause the Zeeman energy level of the atoms to shift, resulting in optical frequency shift. For an atomic magnetometer it acts as a "false" magnetic field, thus causing measurement errors. [0003] The SERF atomic magnetometer is an ultra-high-sensitivity atomic magnetometer. The conventional optical frequency shift suppression method is to adjust the frequency of the pump light to the center of the spectral line of the atomic absorption spectrum. The disadvantage of this method is that it depends on the spectral line measurement accuracy...

AI Technical Summary

Problems solved by technology

[0004] The problem solved by the present invention is: to overcome the problem that the existing optical frequency shift suppression method relies on the measurement accuracy of the spectral line center of the atomic absorption spectrum, to provide a high-precision method for suppressing the optical frequency shift of the SERF atomic magnetometer, using the three-dimensional principle Potential magnetic compensation technology, by measuring the pumping optical frequency and its corresponding magnetic compensation value under two sets of different light intensities, the zero point of optical frequency shift is calculated

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