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Nonlinear spectral features of the relativistic interaction between electron and ultrashort laser pulse

Ziqiang Shao1, Quanli Dong1,2,*, Hao Teng3, Zhe Li1, Dongning Yue1, Qingcao Liu1, Zhiyi Wei3, and Jie Zhang2,3,4

  • 1School of Physics, Harbin Institute of Technology, Harbin 150001, China
  • 2Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
  • 3Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 4Key Laboratory for Laser Plasmas and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

  • *qldong@aphy.iphy.ac.cn
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Phys. Rev. A 107, 053109 – Published 12 May, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.053109

Abstract

Features of the radiation spectra are investigated with the quantum electrodynamic theory for the nonlinear scattering interaction between relativistic electron and few-cycle linearly polarized laser pulse. The angle between the moving direction of the electron and that of the laser pulse affects the scattered radiation characteristics. When the electron has a head-on collision with the laser pulse having a carrier envelope phase as zero, the angular distribution of the scattered radiation spectrum is symmetrical with respect to the laser pulse propagation direction. Such a symmetry disappears when the electron collides with the laser obliquely and the direction of most of the radiation energy shifts at an acute angle towards the electron direction. The CEP has significant effects on the spectral angular distribution. The CEP influence is determined by the exertion of the electromagnetic field on the motion of the electron, whose trajectory overlap in phase space leads to the interference between scattered radiation in different intervals of the interaction process. The supercontinuum radiation could be produced under certain CEPs. An external electrostatic field applied as the environment for the laser-electron interaction is another important factor affecting the scattered radiation features by modulating the harmonic components and their angular distribution. This study may help the analysis of the spectral data from relativistic laser-solid target experiments.

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Outline

Information

Phys. Rev. A 107, 053109– Published 12 May, 2023
  • Received 17 November 2022
  • Revised 12 April 2023
  • Accepted 24 April 2023
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