光抽运
极化(电化学)
自旋极化
超极化(物理学)
磁强计
原子物理学
偏振旋转器
材料科学
圆极化
自旋扩散
光学
物理
磁场
分子物理学
激光器
电子
核磁共振
凝聚态物理
化学
双折射
铁磁性
微带线
核磁共振波谱
量子力学
物理化学
作者
Junpeng Zhao,Gang Liu,Jixi Lu,Ming Ding,Yanning Ma,Jie Ji,Ke Yang,Danyue Ma,Bozheng Xing,Ning Zhang,Chang Sun,Bangcheng Han
标识
DOI:10.1088/1361-6501/abc89c
摘要
Abstract In an optically pumped alkali vapor cell with a high density of atoms, the attenuation of the pump light generates a spatially non-uniform distribution of the electronic spin polarization of alkali atoms, which is detrimental to biomagnetism applications of magnetometers as well as the hyperpolarization of noble gas atoms. Therefore, in this study, we propose a new scheme to generate a nearly uniform, unsaturated spin polarization region based on counter-propagating pump beams and atomic diffusion. A finite element method-based simulation is used to demonstrate the three-dimensional distribution of the spin polarization in a spherical cell. The effects of cell temperature and pump light power on the homogeneity of the spin polarization are studied. The distribution of spin polarization near the center of the cell is experimentally measured and a 1 cm uniform spin polarization region is achieved in the center of the cell. The uniformity of spin polarization in the center region of the cell increased by 50% compared with single beam pumping. The advantage of our proposed scheme is that it can generate an unsaturated uniform region of spin polarization in the center of a cell using a single species of alkali atoms.
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