双光束抽运对全光Cs原子磁力仪灵敏度的影响

Influence of double-pump light on sensitivity of all optical Cs atomic magnetometer

摘要: 原子磁力仪的灵敏度直接取决于抽运光对原子的极化率。分析了Cs原子气室中充入13 332.2 Pa He缓冲气体，两束抽运光频率分别锁定在Cs原子D1线F=4F=3和F=3F=4共振跃迁线时，基态和激发态各磁子能级上粒子数变化的动力学过程，发现在抽运光的持续作用下Cs原子基态F=3和F=4各磁子能级上的粒子被完全抽运至|F=4,mF=4态，Cs原子极化率达到最大值。同时，实验结果证明双光束抽运有效提高了磁力仪响应特性曲线的信噪比，从而使原子磁力仪的灵敏度提高了34%。

Abstract: Atomic polarizability can influence the sensitivity of atomic magnetometer. As the buffer gas of Cs vapor cell was about 13 332.2 Pa, the two pump light frequencies were locked toF=4F=3 and F=3F=4 of Cs D1 transition respectively, the population dynamics of the magnetic sublevels of ground states and excited states were calculated. We find that with the sustained action of pump light ,the population of F=3 and F=4 are pumping to |F=4,mF=4, and the polarizability reaches maximum value. At the same time the signal-noise ratio of experimental result increases effectively by using two pump beams, then the sensitivity of atomic magnetometer increases by 34%.