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Measuring device and measuring method for transverse spin relaxation time of alkali metal atoms

A technology of spin relaxation time and measuring device, applied in the field of measurement

Inactive Publication Date: 2018-07-10
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

Therefore, if the traditional free induction decay method is used to measure the transverse spin relaxation time of an alkali metal atom in a hyperfine energy level of the ground state, the measurement will be affected by the alkali metal atom in another hyperfine energy level of the ground state

Method used

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  • Measuring device and measuring method for transverse spin relaxation time of alkali metal atoms
  • Measuring device and measuring method for transverse spin relaxation time of alkali metal atoms
  • Measuring device and measuring method for transverse spin relaxation time of alkali metal atoms

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Embodiment 1

[0046] A device for measuring the transverse spin relaxation time of alkali metal atoms, see figure 1 , including pumping optical path device 1, detection optical path device 2, atomic gas chamber 3, three-dimensional Helmholtz coil 4, polarization plane detection device 5 and signal processing system 6, details are as follows:

[0047] The atomic gas chamber 3 is filled with alkali metal atoms and buffer gas, and the buffer gas is preferably nitrogen.

[0048] The pumping optical path device 1 forms a pumping optical path, which includes a first laser 1.1, a first beam expander collimator 1.2, and a circularly polarized light conversion device 1.3 arranged in series in sequence. The first laser 1.1 is a DFB semiconductor laser, which can be Adjust to the resonant frequency of the alkali metal atom D1 line transition, and output the pumping light; the first beam expanding and collimating device 1.2 is used for beam expanding and collimating the pumping light output by the firs...

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Abstract

The invention provides a measuring device for the transverse spin relaxation time of alkali metal atoms, wherein the device includes a pumping optical path device, a detecting optical path device, anatomic gas chamber, a three-dimensional Helmholtz coil, a polarizing surface detection device and a signal processing system; the atomic gas chamber is filled with alkali metal atoms and buffer gas; the pumping optical path device includes a first laser, a first beam expanding collimating unit and a circular polarized light conversion device arranged in series successively; the detecting optical path device includes a second laser, a second beam expanding collimating unit and a first linear polarizer. The invention also discloses a measuring method for the transverse spin relaxation time of the alkali metal atoms. With application of the device and the method, the device and the method have the effects that the overall structure is simple; the rotating magnetic fields with different directions are used for accurate measurement of the transverse spin relaxation time of the alkali metal atoms having ground state with different superfine energy levels, and the device and the method can beapplied to study of optical pumping and spin relaxation, and evaluation of properties of atomic magnetometers, atomic spin gyroscopes and the like.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a device and method for measuring the transverse spin relaxation time of alkali metal atoms. Background technique [0002] The outermost shell of an alkali metal atom has only one electron, which makes the alkali metal atom exhibit many unique properties and attracts extensive research interest. At present, alkali metal atoms are widely used in atomic clocks, Faraday filters, atomic interferometers, atomic spin gyroscopes, and atomic magnetometers. For some application fields of alkali metal atoms, such as atomic spin gyroscopes and atomic magnetometers, the transverse spin relaxation time of alkali metal atoms is an extremely important parameter. The transverse spin relaxation time of alkali metal atoms directly determines the limit sensitivity and response linewidth of the atomic magnetometer, and the accuracy of the atomic spin gyroscope is also directly related to the t...

Claims

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Application Information

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IPC IPC(8): G01N21/21G01R35/00G01C25/00
CPCG01C25/00G01N21/21G01N2021/216G01R35/00
Inventor 丁志超袁杰龙兴武姜鹏罗晖
Owner NAT UNIV OF DEFENSE TECH
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