Investigation of spatial spin polarization of 87Rb and 129Xe atomic ensemble pumped by Gaussian beam in a miniature nuclear magnetic resonance gyroscope

Shu Qiang; Ji Fang

doi:10.1117/12.2667783

27 February 2023 Investigation of spatial spin polarization of ⁸⁷Rb and ¹²⁹Xe atomic ensemble pumped by Gaussian beam in a miniature nuclear magnetic resonance gyroscope

Shu Qiang, Ji Fang

Author Affiliations +

Proceedings Volume 12585, International Conference on Precision Instruments and Optical Engineering (PIOE 2022); 1258509 (2023) https://doi.org/10.1117/12.2667783
Event: International Conference on Precision Instruments and Optical Engineering (PIOE 2022), 2022, Guangzhou, China

Abstract

The spin polarization of ⁸⁷Rb and ¹²⁹Xe atomic ensemble has great impact on the signal intensity of a nuclear magnetic resonance gyroscope. The coupled spin polarization modelling process for ⁸⁷Rb and ¹²⁹Xe atoms ensemble is presented in detail. Three dimensional spatial distribution of the spin polarization field is obtained by numerical solution and is in good agreement with the experiment results. Influencing factors including temperature, power and detuned frequency of the pumping laser, average collision times of anti-relaxation coatings and partial pressure of gas composition are investigated. The work presents an indirect method to estimate the average collision times given the Xe polarization with different temperatures. It is found the average collision times of the ¹²⁹Xe atoms with the inner surface of a bare glass cell of 3×3×3mm³ can reach up to about 2.7×10⁵ times. It is also found that the pumping frequency corresponding to the maximum polarization of the Xe atoms polarized by spin exchange of Rb atoms is not consistent with the D₁ line of the ⁸⁷Rb atom when the temperature of the cell is above a certain temperature, but is detuned at a certain frequency. Quantitative analysis of the effect of anti-relaxation coatings on the spin polarization suggests that the appropriate average number of collisions of the Rb atoms with the inner surface of the cell is about 1500 times.

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Shu Qiang and Ji Fang "Investigation of spatial spin polarization of ⁸⁷Rb and ¹²⁹Xe atomic ensemble pumped by Gaussian beam in a miniature nuclear magnetic resonance gyroscope", Proc. SPIE 12585, International Conference on Precision Instruments and Optical Engineering (PIOE 2022), 1258509 (27 February 2023); https://doi.org/10.1117/12.2667783

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KEYWORDS

Xenon

Rubidium

Chemical species

Spin polarization

Polarization

Magnetism

Optical pumping

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