High ellipticity of harmonics from molecules in strong laser fields of small ellipticity

F. J. Sun, C. Chen, W. Y. Li, X. Liu, W. Li, and Y. J. Chen
Phys. Rev. A 103, 053108 – Published 10 May 2021

Abstract

We study high-order harmonic generation (HHG) from aligned molecules in strong elliptically polarized laser fields numerically and analytically. Our simulations show that the spectra and polarization of HHG depend strongly on the molecular alignment and the laser ellipticity. In particular, for small laser ellipticity, large ellipticity of harmonics with high intensity is observed for parallel alignment, along with forming a striking ellipticity hump around the threshold. We show that the interplay of the molecular structure and two-dimensional electron motion plays an important role here. This phenomenon can be used to generate bright elliptically polarized extreme ultraviolet pulses.

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  • Received 15 January 2021
  • Revised 20 April 2021
  • Accepted 21 April 2021

DOI:https://doi.org/10.1103/PhysRevA.103.053108

©2021 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

F. J. Sun1, C. Chen1,2,*, W. Y. Li3, X. Liu4, W. Li4, and Y. J. Chen1,†

  • 1College of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China
  • 2School of Physics, Hebei Normal University, Shijiazhuang 050024, China
  • 3School of Mathematics and Science, Hebei GEO University, Shijiazhuang 050031, China
  • 4Beijing Institute of Space Mechanics and Electricity, Chinese Academy of Space Technology, Beijing 100094, China

  • *chenchao1202@163.com
  • chenyjhb@gmail.com

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Issue

Vol. 103, Iss. 5 — May 2021

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