Mixed pumped alkali metal gas chamber density ratio control method

Abstract

The invention discloses a mixed pumped alkali metal gas chamber density ratio control method. The method utilizes a distillation purification method to control the atomic weight of an alkali metal sothat the density ratio of the two alkali metal atoms is changed, and accurately control the density ratio by combination of a distillation temperature and a molecular pump pumping speed. Compared withthe traditional mixed pumped alkali metal gas chamber density ratio control method, the method provided by the invention utilizes an oil bath pot to control a distillation temperature so that the temperatures in the alkali metal gas chamber are more uniform and accurate. The method utilizes a white light source to perform spectral absorption measurement of an alkali metal gas chamber and calculates an alkali metal atomic density ratio. The method realizes on-line control and on-line measurement and greatly improves the precision of the mixed pumped alkali metal gas chamber density ratio and the preparation efficiency of the gas chamber.

Description

technical field [0001] The invention relates to the field of alkali metal atom production and density ratio control of an atomic magnetometer. In particular, the method of distillation and purification is used to control the atomic density ratio of alkali metals in the process of mixing and pumping alkali metal gas chambers, so that the density ratio control is more accurate. Background technique [0002] In a spin-exchange-relaxation-free (SERF) atomic magnetometer, uniform atomic polarizability can ensure the consistency of magnetometer signals and reduce gradient noise. How to obtain uniform atomic polarizability is required in experimental research solved problem. The emergence of the hybrid optical pumping method effectively solves the problem of poor 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 ato...

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Problems solved by technology

Another method is the chemical reaction method. In the process of making an alkali metal gas chamber, two sets of chemical reaction processes are used to obtain the corresponding two kinds of alkali metal atoms. Although the chemical reaction method has been used to make a single alkali metal gas atom gas chamber , but the mixed pumping of two alkali metal atoms requires high temperature and high pressure, and the conditions are extremely harsh and complicated, making it difficult to achieve

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