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Computational Investigation of the Interaction Between Hydrogen Atoms and an Intense Circularly Polarized Laser Field

Published online by Cambridge University Press:  20 August 2015

Lifeng Yang ,
Wang Xu ,
Qiren Zhang ,
Wen Luo ,
Qiangyan Pan ,
Xiaolu Cai ,
Gongtao Fan ,
Yongjiang Li ,
Benji Xu  and
Zhe Yan
...Show all authors
Lifeng Yang
Affiliation:
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China Graduate School of the Chinese Academy of Sciences, Beijing 10039, China
Wang Xu*
Affiliation:
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
Qiren Zhang
Affiliation:
Departments of Technical Physics, Peking University, Beijing 100871, China
Wen Luo
Affiliation:
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China Graduate School of the Chinese Academy of Sciences, Beijing 10039, China
Qiangyan Pan
Affiliation:
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
Xiaolu Cai
Affiliation:
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China Graduate School of the Chinese Academy of Sciences, Beijing 10039, China
Gongtao Fan
Affiliation:
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China Graduate School of the Chinese Academy of Sciences, Beijing 10039, China
Yongjiang Li
Affiliation:
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China Graduate School of the Chinese Academy of Sciences, Beijing 10039, China
Benji Xu
Affiliation:
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
Zhe Yan
Affiliation:
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
Guangwei Fan
Affiliation:
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China Graduate School of the Chinese Academy of Sciences, Beijing 10039, China
Zhendong An
Affiliation:
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China Graduate School of the Chinese Academy of Sciences, Beijing 10039, China
*
*Corresponding author.Email:xuwang@sinap.ac.en
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Abstract

The study of interactions between a high-power laser and atoms has been one of the fundamental and interesting topics in strong field physics for decades. Based on a nonperturbative model, ten years ago, we developed a set of programs to facilitate the study of interactions between a circularly polarized laser and atomic hydrogen. These programs included only contribution from the bound states of the hydrogen atom. However, as the laser intensity increases, contribution from continuum states to the excitation and ionization processes becomes larger and can no longer be neglected. Furthermore, because the original code is not able to add this contribution directly due to its many disadvantages, a major upgrade of the code is required before including the contribution from continuum states in future. In this paper, first we deduce some important formulas for contribution of continuum states and present modifications and tests for the upgraded code in detail. Second we show some comparisons among new results, old results from the original codes and the available experimental data. Overall the new result agrees with experimental data well. Last we present our calculation of above-threshold ionization (ATI) rate and compare it with a pertuba-tive calculation. The comparison shows that our nonperturbative calculation can also produce ATI peak suppression.

Keywords

32.80.Fb42.50.Hz32.80RmHydrogen atomshigh-power lasernonperturbativephotoionization
Type
Research Article
Information
Communications in Computational Physics , Volume 11 , Issue 3 , March 2012 , pp. 756 - 774
Copyright
Copyright © Global Science Press Limited 2012

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