高频强激光场中氢原子基态电离特性研究  

Ionization characteristics of the hydrogen ground state in an intense high-frequency laser field

作　　者：高婉琴 王加祥[1] 张雅芸[1] 

机构地区：[1]华东师范大学精密光谱科学与技术国家重点实验室,上海200062

出　　处：《华东师范大学学报（自然科学版）》2015年第1期186-194,共9页Journal of East China Normal University(Natural Science)

基　　金：自然科学基金面上项目(11274117)

摘　　要：本文采用相空间平均法详细研究了氢原子H的基态(1s)在外加高频强激光脉冲作用下的电离率及光电子角分布情况.侧重探讨了激光频率、偏振、脉冲长度和位相对原子电离的影响.研究发现,对超短脉冲,电离对激光场的位相非常敏感.根据激光脉冲上升沿和下降沿陡峭程度,提出了"位相模糊区"的概念,对基态氢原子电离特性的位相依赖给予了很好的区分和解释.By using phase average method,the ionization dynamics of the hydrogen ground state （1s） under an intense high-frequency laser pulse has been studied in details.The influence of the laser frequency,polarization,pulse length and phase upon the ionization rate are explored.It is found that the ionization is very sensitive to the pulse phase.According to the steepness of the pulse rising and falling time,we found a ＂mixed regime＂ in the pulse phase,which can be used to explain the different dynamics of the ionization.

关 键 词：高频激光场 氢原子电离 稳定性 光电子角分布 

分 类 号：O437[机械工程—光学工程]