中国激光, 2020, 47 (3): 0304001, 网络出版: 2020-03-12
基于原子自由进动的光缩效应实验研究 下载: 964次
Experimental Demonstration of Light Narrowing Effect Based on Free Atomic Spin Precession
原子与分子物理学 原子磁力仪 脉冲泵浦式 磁共振 自旋交换弛豫 atomic and molecular physics atomic magnetometer pulse-pumped mode magnetic resonance spin-exchange relaxation
摘要
在一定磁场下,自旋交换碰撞是原子磁力仪保持相干的一个主要限制因素,直接影响磁力仪能够达到的探测灵敏度。光缩效应可以对自旋交换碰撞展宽进行抑制,之前对光缩效应的观测是基于泵浦激光和射频场连续工作的方式,但会对原子共振展宽产生额外的影响。基于脉冲泵浦式原子磁力仪,通过极大限度地减小原子破坏性碰撞和外磁场空间不均匀性对共振展宽的影响,实现了对光缩效应的直接实验观测和验证。脉冲泵浦的方式有利于原子高极化度的实现,研究光缩效应对探索脉冲泵浦原子磁力仪的灵敏度极限具有重要意义。
Abstract
In a certain magnetic field, spin exchange collision is one of the limiting factors for coherence preserving in atomic magnetometers, which directly affects the detection sensitivity that the magnetometer can achieve. The light narrowing effect can be used to reduce the resonance linewidth caused by spin-exchange collisions. Previous observations of the light narrowing effect are based on atomic magnetometers with continuous pumped laser and radio frequency field, which have additional effects on the atomic resonance linewidth. Based on a pulse-pumped atomic magnetometer, the effects of atomic destructive collisions and magnetic field inhomogeneity on resonance linewidth are greatly reduced, and a direct experimental observation and verification of the light narrowing effect are realized. As pulse-pumped mode is beneficial to the realization of high atomic polarization, the study of light narrowing effect is of great importance for exploring the sensitivity limit of pulse-pumped atomic magnetometers.
郑文强, 毕欣, 章国亿, 苏圣然, 李劲松, 林强. 基于原子自由进动的光缩效应实验研究[J]. 中国激光, 2020, 47(3): 0304001. Zheng Wenqiang, Bi Xin, Zhang Guoyi, Su Shengran, Li Jingsong, Lin Qiang. Experimental Demonstration of Light Narrowing Effect Based on Free Atomic Spin Precession[J]. Chinese Journal of Lasers, 2020, 47(3): 0304001.