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由動態Stark效應誘導的氫原子渦旋動量分布

Dynamic-Stark-Effect Induced Distortion of Vortex Momentum Distributions of Hydrogen Atoms

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摘要

采用強場近似方法,對處于兩個具有時間延遲的圓偏振激光場中氫原子的渦旋狀光電子動量分布進行了數值模擬。在兩個延時激光脈沖的作用下,電子吸收光子后克服電離閾值,從基態經由兩個不同的通道躍遷到連續態,產生的電子波包之間會發生干涉。模擬結果表明,所產生的光電子動量渦旋的旋向與兩脈沖的偏振方向有關,渦旋臂的數目與激光載波頻率有關。動態Stark效應是一種典型的強場現象。若在電離發生的同時考慮動態Stark效應,將會觀察到動量渦旋的扭曲。對順時針的動量渦旋及其扭曲進行分析,發現扭曲現象是由動態Stark效應引入的附加相位的時間非線性特性引起的。

Abstract

In this study, the vortex-shaped photoelectron momentum distributions of a hydrogen atom ionized by two time-delayed circularly polarized laser fields are numerically simulated based on the strong field approximation (SFA) theory. Under the action of two time-delayed laser pulses, the electron absorbs photons to overcome the ionization threshold and undergoes photoionization via two different transition channels to reach the continuum states for electron wave-packet interference. The simulation results show that the orientation of the photoelectron momentum vortices is observed to be related with the polarization directions of the two pulses, whereas the number of vortex arms is related with the carrier frequencies. Furthermore, the dynamic Stark effect is a ubiquitous strong field process, which would result in the distortion of the vortex-shaped momentum distributions when considered. On this basis, the clockwise momentum vortices and their distortion are specifically investigated, revealing that the distortion is attributed to the nonlinear properties of the phase associated with the dynamic Stark effect.

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補充資料

DOI:10.3788/AOS201939.0602001

所屬欄目:原子與分子物理學

基金項目:國家自然科學基金;

收稿日期:2019-01-09

修改稿日期:2019-03-04

網絡出版日期:2019-06-17

作者單位    點擊查看

孔雪蓮:天津大學精密儀器與光電子工程學院光電信息技術教育部重點實驗室, 天津 300072
張貴忠:天津大學精密儀器與光電子工程學院光電信息技術教育部重點實驗室, 天津 300072
汪天慶:天津大學精密儀器與光電子工程學院光電信息技術教育部重點實驗室, 天津 300072
丁欣:天津大學精密儀器與光電子工程學院光電信息技術教育部重點實驗室, 天津 300072
姚建銓:天津大學精密儀器與光電子工程學院光電信息技術教育部重點實驗室, 天津 300072

聯系人作者:張貴忠(johngzhang@tju.edu.cn)

備注:國家自然科學基金;

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引用該論文

Xuelian Kong, Guizhong Zhang, Tianqing Wang, Xin Ding, Jianquan Yao. Dynamic-Stark-Effect Induced Distortion of Vortex Momentum Distributions of Hydrogen Atoms[J]. Acta Optica Sinica, 2019, 39(6): 0602001

孔雪蓮, 張貴忠, 汪天慶, 丁欣, 姚建銓. 由動態Stark效應誘導的氫原子渦旋動量分布[J]. 光學學報, 2019, 39(6): 0602001

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