光学学报, 2018, 38 (2): 0202001, 网络出版: 2018-08-30
关键参数对锂原子光致漂移速率影响的数值研究 下载: 664次
Numerical Simulation on Effect of Key Parameters on Light-Induced Drift Velocity of Lithium Atoms
原子与分子物理学 光致漂移速率 强碰撞模型 锂原子 atomic and molecular physics light-induced drift velocity strong collision model lithium atom
摘要
光致漂移速率是用来衡量光致漂移效应大小的重要参数,对光致漂移研究具有重要意义。利用强碰撞模型描述光致漂移过程中锂原子与缓冲气体的碰撞作用,并考虑了超精细结构和能级简并对光致漂移过程的影响,通过建立速率方程来表示不同速度的锂原子在各能级上的布居,从而获得锂原子的漂移速率。同时研究了激发光波长、激发光功率密度、缓冲气体压强、缓冲气体种类、气体温度等对锂光致漂移速率的影响。由理论计算结果可以看出,利用该方法计算所得的漂移速率随各参数的变化关系基本符合光致漂移的物理原理分析和相关文献中的实验结果规律。
Abstract
Light-induced drift velocity is an important parameter to evaluate the effect of light-induced drift, so it is important for the research of light-induced drift. In this paper, strong collision model is used to describe collision of lithium atoms and buffer gas. The effects of hyperfine structure and degeneracy of energy level on light-induced drift are also considered when establishing rate equation to express the distribution of lithium atoms in different velocities and different energy levels. In this way, light-induced drift velocity of lithium atoms is obtained. In the meantime, the influences of several parameters, like laser wavelength, laser power density, buffer gas pressure, type of buffer gas, and temperature on light-induced drift velocity of lithium are also studied. It can be seen that the relationship between light-induced drift velocity and each parameter confirms with physical principles of light-induced drift and experimental results of related literatures.
杨佳琦, 张志忠, 熊明. 关键参数对锂原子光致漂移速率影响的数值研究[J]. 光学学报, 2018, 38(2): 0202001. Jiaqi Yang, Zhizhong Zhang, Ming Xiong. Numerical Simulation on Effect of Key Parameters on Light-Induced Drift Velocity of Lithium Atoms[J]. Acta Optica Sinica, 2018, 38(2): 0202001.