Atom magnetometer and in-situ detection method for alkali metal atom air chamber pressure intensity thereof

Abstract

The invention discloses an atom magnetometer and an in-situ detection method for alkali metal atom air chamber pressure intensity thereof. The atom magnetometer comprises a light source, a polarizer,a quarter-wave plate, the alkali metal atom air chamber, a non-magnetic electric heating film, an optical micro-cavity, a micro-nano optical fiber, a beam splitter prism, a spectrograph and a signal processing circuit. And the optical micro-cavity is in contact with the micro-nano optical fiber and is integrated in the alkali metal atom air chamber. And the pressure in the alkali metal atom air chamber is calculated by measuring the resonant wavelength and the wavelength variation of the optical micro-cavity. According to the method, the signal of the atom magnetometer and the pressure signalof the alkali metal atom air chamber can be simultaneously extracted from the output signal of the alkali metal atom air chamber. The pressure intensity of the alkali metal atom air chamber can be detected while the atom magnetometer works normally, and the measurement precision is high. And meanwhile, no magnetic field noise is introduced into the optical micro-cavity. The method can also be usedin other quantum precision measurement systems using alkali metal atom gas chambers.

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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