基于激光源的高准确度He-Cs光泵磁力仪研究

Research of High-precision He-Cs Optically Pumped Magnetometer Based on Laser Source

采用锁定于Cs原子D1线Fg=4→Fe=3跃迁能级的894nm激光极化了填充有Cs原子和4He原子混合原子吸收室中的Cs原子,然后通过Cs原子和4He原子的自旋交换作用使得亚稳态4He原子产生极化。这种采用间接方式实现4He原子极化的方法,可以避免4He原子与光源直接作用产生的光频移,能够非常有效地减小共振线宽和实现高准确度磁场测量。设计了自旋极化的亚稳态4He原子在磁场中的拉莫尔频率检测电路以实现磁场测量。

Cs atoms in the atomic absorption chamber filled with Cs and4 He atoms has been polarized by894 nm laser locked to Fg=4→Fe=3 energy level of Cs atomic D1 level. Metastable4 He atoms can be polarized by the spin exchange of4 He atoms and polarized Cs atoms. For the indirect method to polarize4 He atoms,light shift owing to direct interaction of4 He atoms and light source can be avoided,then resonance linewidth can be decreased effectively and high-precision magnetic measurement can be realized.Larmor frequency detection circuit of metastable4 He atoms in magnetic field has been designed to realize magnetic measurement.