Atomic magnetometer and its in-situ detection method of alkali metal atom gas chamber pressure

Abstract

The invention discloses an atomic magnetometer and an in-situ detection method for the pressure of an alkali metal atomic gas chamber, wherein the atomic magnetometer includes a light source, a polarizer, a quarter-wave plate, an alkali metal atomic gas chamber, and a non-magnetic electric heating film , optical microcavities, micro-nano fibers, spectroscopic prisms, spectrometers and signal processing circuits. The optical microcavity is in contact with the micro-nano fiber and integrated in the alkali metal atomic gas chamber. By measuring the resonant wavelength and wavelength variation of the optical microcavity, the pressure in the alkali metal atom gas chamber is calculated. The method can simultaneously extract the signal of the atomic magnetometer and the pressure signal of the alkali metal atomic gas chamber from the output signal of the alkali metal atomic gas chamber. It can detect the pressure of the alkali metal atom gas chamber while the atomic magnetometer is working normally, and has high measurement accuracy. At the same time, the optical microcavity does not introduce any magnetic field noise. The method can also be used in other quantum precision measurement systems utilizing gas cells of alkali metal atoms.

Description

technical field [0001] The invention relates to the technical field of quantum precision measurement, in particular to an atomic magnetometer and an in-situ detection method for the gas chamber pressure of an alkali metal atom. Background technique [0002] In a high-sensitivity atomic magnetometer, in order to reduce the relaxation of alkali metal atoms, it is usually necessary to inject a certain amount of buffer gas into the gas cell of alkali metal atoms to reduce the relaxation of electron spin damage. At the same time, in order to avoid the influence of fluorescence effect on electron pumping, the gas chamber of alkali metal atoms is filled with quenching gas to capture the photons radiated during the depolarization of the outermost electrons of alkali metal atoms, so as to avoid the influence of fluorescence effect on electron pumping. Electron pumping has an effect. The pressures of the buffer gas and the quenching gas affect the relaxation rate and polarizability o...

AI Technical Summary

Problems solved by technology

At present, the spectral absorption method is commonly used to measure the pressure broadening of the alkali metal atomic absorption line, thereby fitting the pressure of the alkali metal atomic gas chamber, but this method has a large error, and it is difficult to accurately measure the pressure of the alkali metal atomic gas chamber

At the same time, this method needs to tune the light source to measure in the range of pressure broadening, so it cannot be measured while the atomic magnetometer is working, which reduces the measurement efficiency

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