SERF atom magnetometer electron polarizability measurement method

Abstract

The present invention relates to an SERF (Spin-Exchange Relaxation-Free) atom magnetometer electron polarizability measurement device and method. A traditional method measures a Faraday rotation anglegenerated by penetrating an atomic chamber by a linear polarization laser to calculate and obtain an electron polarizability, and the method is easy to be influenced by atomic density errors and rotation angle detection errors and is limited in measurement precision. The method disclosed by the invention comprises the steps of: measuring a resonant frequency of an SERF atom magnetometer in a magnetic field with a known size, and employing the resonant frequency, the size of the magnetic field and the gyromagnetic ratio of electrons to calculate electron slowing factors in an SERF state so asto calculate the electron polarizability according to a function relation of the slowing factors and the electron polarizability. The measurement precision is dependent on the precision of the appliedmagnetic field and the measurement precision of the resonant frequency, and is not limited to the atomic density and rotation angle detection errors, and therefore, the SERF atom magnetometer electron polarizability measurement device and method are higher in precision compared to the prior art.

Description

Technical field [0001] The invention relates to a method for measuring the electronic polarizability 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] SERF Atomic Magnetometer is an ultra-high sensitivity magnetometer. It uses alkali metal atoms (potassium, rubidium, cesium) as its sensitive medium. The electronic polarizability of alkali metal atoms is an important part of SERF atomic magnetometer. Parameters directly affect the signal strength and sensitivity of the magnetometer. The conventional method of measuring the electron polarizability of alkali metal atoms is to use a beam of detuned linear polarization detection laser to pass through the atomic gas cell, measure the Faraday rotation angle generated by the detection laser, and then calculate the electron polarization by theoretical formula However, this method is ea...

AI Technical Summary

Problems solved by technology

[0003] The problem solved by the present invention is: to overcome the problem that the existing electronic polarizability measurement method depends on the measurement accuracy of atomic density and Faraday optical rotation angle, firstly measure the resonant frequency of the SERF atomic magnetometer under a magnetic field of known size, and then use The resonant frequency and the magnitude of the magnetic field calculate the slowing factor of the electron precession, and then calculate the electronic polarizability through the theoretical formula

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