Light shift elimination method for SERF atomic spin magnetometers

Abstract

The invention discloses a light shift elimination method for SERF atomic spin magnetometers; the light shift measurement and elimination method based on the dichroism principle is provided aiming at the problem that sensitivity of the SERF atomic spin magnetometer in measurement may be influence by light shift. According to the light shift elimination method, the deficiency of lack of effective light shift measurement, monitoring and elimination methods is made up, and meanwhile improvement on sensitivity of the SERF atomic spin magnetometer is guaranteed.

Description

technical field [0001] The invention relates to a method for eliminating optical displacement of a SERF atomic spin magnetometer, which belongs to the technical field of optical detection and weak magnetic detection. Background technique [0002] The SERF atomic spin magnetometer (hereinafter referred to as the atomic magnetometer) has become a project developed by foreign military powers because of its ultra-high theoretical sensitivity. The atomic magnetometer is a magnetic field measurement device based on ultra-fine energy level atomic transitions and works in a weak magnetic environment. It mainly includes: pumping optical system, detection optical system, magnetic field shielding and magnetic field compensation system, non-magnetic electric heating systems and alkali metal gas chambers, etc. [0003] Under the action of light and external magnetic field, the Zeeman effect (Zeeman effect) and Stark effect (Stark effect) will occur in the atomic energy level, so that it...

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Problems solved by technology

Due to the instability of the pumping laser, the optical power and frequency fluctuate, and the optical displacement will output these fluctuations in the form of noise, which becomes one of the important sources of error in the pumping optical system, which greatly limits the sensitivity of the SERF atomic spin magnetometer.

[0006] Optical displacement commonly exists in atomic devices, such as atomic clocks, atomic frequency standards, etc. At present, foreign scholars have proposed many effective optical displacement elimination methods for the above two atomic devices, for example, using single-mode lasers to generate multi-mode lasers, Then make these multi-mode lasers produce light displacements of equal size but opposite directions, so that the light displacements in each direction can cancel each other out to achieve the purpose of elimination; and then use adjustable microwaves to excite the alkali metal atoms in the gas chamber to lock the resonance peak. frequency, and adjust the laser frequency to cancel the optical displacement, however, these methods are not suitable for SERF atomic spin magnetometer

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