Hybrid optical pumping SERF atom magnetometer device and density ratio optimization method thereof

A technology of atomic magnetic strength and optimization method, which is applied in the direction of measuring devices, the size/direction of magnetic field, and the use of magneto-optical equipment for magnetic field measurement, etc., can solve the problem of affecting the signal stability of SERF atomic magnetometer, increasing atomic relaxation, etc. problem, to achieve the effect of improving the efficiency of atomic polarization and improving the uniformity of atomic polarization

CN108490374AActive Publication Date: 2018-09-04BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-09-04

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Abstract

The invention discloses a hybrid optical pumping spin exchange relaxation-free (SERF) atom magnetometer device and a density ratio optimization method thereof. The density ratio optimization method optimizes the alkali metal atomic density ratio of the magnetometer from the viewpoint of optical frequency shift suppression and improvement of signal stability of the magnetometer, and finally realizes the optimum alkali metal atomic density ratio which is insensitive to the pumping optical power and the pumping optical frequency fluctuation. Compared with a traditional single alkali metal SERF atom magnetometer, the hybrid optical pumping SERF atom magnetometer has the advantage of uniform atomic polarizability. Compared with a traditional mixed optical pumping SERF atom magnetometer, the hybrid optical pumping SERF atom magnetometer comprehensively considers the interaction and influence of alkali metal atomic density ratio, optical frequency shift, pumping optical power and pumping light frequency, and is a multi-physical-quantity coupling optimization method. The density ratio optimization method of the hybrid optical pumping SERF atom magnetometer can effectively improve signal stability of the SERF atom magnetometer.
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Description

technical field

[0001] The invention relates to the field of alkali metal atomic density measurement and optimization of a sub-atom magnetometer. In particular, a hybrid optically pumped spin-exchange-relaxation-free (SERF) atomic magnetometer device and a method for optimizing its density ratio. Background technique

[0002] In the SERF atomic magnetometer, the atomic polarization efficiency and the uniformity of the atomic polarization are the problems to be solved in the research. The emergence of a hybrid optical pumping method effectively solves the problems of atomic polarization efficiency and 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 atoms with a larger optical depth to be measured through the collision between the alkali metal atoms , can make the atomic polarization more uniform, and experim...

Examples

Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] Such as figure 1 As shown, the mixed light pumping SERF atomic magnetometer device of the present invention includes a K / Rb mixed alkali metal gas chamber 1, an oven 2, a vacuum chamber 3, a three-dimensional magnetic compensation coil 4, a magnetic shielding bucket 5, and a pumping light source 6 , beam expander 7, linear polarizer 8, 1 / 4 wave plate 9, detection light source 10, beam expander 11, linear polarizer 12, Faraday modulator 13, linear polarizer 14, photodetector 15, lock-in amplifier 16. Data collection and analysis system17.

[0028] The K / Rb mixed alkali metal gas chamber 1 is fixed in the center of the boron nitride ceramic oven 2, and is heated to 200°C by an electric heating film to ensure a high atomic number density of the alkali metal. The gas chamber and the oven are placed in the vacuum chamber 3, using vacuum The...