Hybrid optical pumping SERF atom magnetometer device and density ratio optimization method thereof

Abstract

The invention discloses a hybrid optical pumping spin exchange relaxation-free (SERF) atom magnetometer device and a density ratio optimization method thereof. The density ratio optimization method optimizes the alkali metal atomic density ratio of the magnetometer from the viewpoint of optical frequency shift suppression and improvement of signal stability of the magnetometer, and finally realizes the optimum alkali metal atomic density ratio which is insensitive to the pumping optical power and the pumping optical frequency fluctuation. Compared with a traditional single alkali metal SERF atom magnetometer, the hybrid optical pumping SERF atom magnetometer has the advantage of uniform atomic polarizability. Compared with a traditional mixed optical pumping SERF atom magnetometer, the hybrid optical pumping SERF atom magnetometer comprehensively considers the interaction and influence of alkali metal atomic density ratio, optical frequency shift, pumping optical power and pumping light frequency, and is a multi-physical-quantity coupling optimization method. The density ratio optimization method of the hybrid optical pumping SERF atom magnetometer can effectively improve signal stability of the SERF atom magnetometer.

Description

technical field [0001] The invention relates to the field of alkali metal atomic density measurement and optimization of a sub-atom magnetometer. In particular, a hybrid optically pumped spin-exchange-relaxation-free (SERF) atomic magnetometer device and a method for optimizing its density ratio. Background technique [0002] In the SERF atomic magnetometer, the atomic polarization efficiency and the uniformity of the atomic polarization are the problems to be solved in the research. The emergence of a hybrid optical pumping method effectively solves the problems of atomic polarization efficiency and atomic polarization uniformity. The density ratio of the two alkali metal atoms is different, the light interacts with and polarizes the alkali metal atoms with a smaller optical depth, and polarizes the alkali metal atoms with a larger optical depth to be measured through the collision between the alkali metal atoms , can make the atomic polarization more uniform, and experim...

AI Technical Summary

Problems solved by technology

The optical frequency shift is equivalent to a false magnetic field, which is affected by the pumping optical power, pumping optical frequency, alkali metal atomic density, and alkali metal atomic density ratio. Its existence will not only increase the relaxation of atoms, but also its fluctuation will affect SERF atoms Stability of magnetometer signal

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