AC Stark Effect on Vortex Spectra Generated by Circularly Polarized Pulses

被引：10

作者：

Li, Meng ^{[1
,2
]}

Zhang, Guizhong ^{[1
]}

Ding, Xin ^{[1
]}

Yao, Jianquan ^{[1
]}

机构：

[1] Tianjin Univ, Coll Precis Instrument & Optoelect Engn, Key Lab Optoelect, Tianjin 300072, Peoples R China

[2] Civil Aviat Univ China, Key Lab Operat Programming & Safety Technol Air T, Tianjin 300300, Peoples R China

来源：

IEEE PHOTONICS JOURNAL | 2019年 / 11卷 / 03期

基金：

中国国家自然科学基金;

关键词：

ELECTRON; DYNAMICS;

D O I：

10.1109/JPHOT.2019.2916106

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this paper, we report the results of numerical simulation on vortex-shaped photoelectron momentum spectra of the hydrogen atom irradiated by a pair of time-delayed circularly polarized ultrashort pulses. Spectral alterations including broadening, splitting, and fusion are observed with stronger pulse intensity deploying the quantum wave-packet theory. These alterations of the dynamic interference structure are further investigated to stem from the ac Stark effect, by making the local approximation for an analytical ansatz. In addition, for evaluating the ac Stark effect on the hydrogen atom quantitatively, we propose a nonlinear-curve-fitting algorithm of the ground-state population for extracting the complex Stark coefficient, which we define. We find that the ac Stark effect can be well characterized by the complex coefficient, as supported by the overall agreement between the momentum spectra obtained from the wave-packet theory and the local approximation ansatz. The present research may shed further light on Stark effect in laser atom interactions.

引用

页数：11

共 43 条

[1] Interrogation of orbital structure by elliptically polarized intense femtosecond laser pulses [J].