首页|A polarized 3He system based on metastability-exchange optical pumping

A polarized 3He system based on metastability-exchange optical pumping

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Hyperpolarized 3He nuclei have emerged as a significantly important approach in quantum precision measurement techniques,with extensive applications in fundamental physics,magnetometry,metrology,and beyond.In this study,we report on the design and implementation of a 3He polarization system at the China Mianyang Research Reactor(CMRR),utilizing the metastability-exchange optical pumping(MEOP)method.We employed a Merritt coil system consisting of four square coils to furnish a uniform holding field.We deployed a 2 W fiber laser to pump the metastable 3He atoms and conducted free induction decay(FID)detection of the polarized 3He nuclei using both pickup coil and optical methods.For the optical method,we used a 50 mW linearly polarized distributed Bragg reflector(DBR)laser as the probe.We applied transverse light absorption polarime-try to measure the absolute nuclear polarization of the ground-state 3He.We have developed cell fabrication capabilities at the CMRR,and cells at various pressures ranging from 100 to 1000 Pa have been fabricated and evaluated.For a typical borosilicate cell with 100 Pa pressure,the absolute polarization is measured as Pn ≈ 70％,and the transverse relaxation time is estimated as T2 ≈ 0.5 s.Moreover,we constructed a few aluminosilicate cells,each carefully filled with pure 3He at a pressure of 100 Pa.Subsequently,we conducted a comprehensive evaluation of their performance in the context of MEOP.

metastability exchangeoptical pumpingpolarized3 Hemagnetic resonance

Yuting Wang、Liangyong Wu、Kaiyuan Zhang、Mei Peng、Siyu Chen、Haiyang Yan

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State Key Laboratory of Nuclear Physics and Technology,School of Physics,Peking University,Beijing 100871,China

Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China

Key Laboratory of Nuclear Physics and Ion-beam Application(MOE),Fudan University,Shanghai 200433,China

Key Laboratory of Neutron Physics,Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaSichuan Science and Technology ProgramNational Key Research and Development Program of ChinaNational Key Research and Development Program of China

U2230207U203020912305114123051252024NSFSC13562020YFA04060012020YFA0406002

2024

10.1007/s11433-023-2355-7

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(7)