Origin of ellipticity of high-order harmonics generated by a two-color laser field in the cross-polarized configuration

S. Stremoukhov, A. Andreev, B. Vodungbo, P. Salières, B. Mahieu, and G. Lambert
Phys. Rev. A 94, 013855 – Published 29 July 2016

Abstract

Recently several techniques demonstrated the production of elliptically polarized high harmonics. One of these techniques consists of the interaction in a noble gas of two-color laser beams having orthogonal linear polarizations. Here we present the theoretical explanation of such a result observed in Lambert et al. [Nat. Commun. 6, 6167 (2015)]. Numerical calculations based on the nonperturbative light-atom interaction theory reproduce well the experimental data. The degree of polarization is analyzed for different harmonic orders and found to be high. With the help of a simplified theoretical model it is shown that the degree of harmonic ellipticity depends mainly on the population of atomic state sublevels with different angular momentum projections.

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  • Received 18 December 2015

DOI:https://doi.org/10.1103/PhysRevA.94.013855

©2016 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

S. Stremoukhov1,2,*, A. Andreev1, B. Vodungbo3,4, P. Salières5, B. Mahieu3, and G. Lambert3

  • 1Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, 1, building 2, Moscow 119991, Russia
  • 2National Research Centre “Kurchatov Institute,” 1 Akademika Kurchatova Place, Moscow 123182, Russia
  • 3LOA, ENSTA ParisTech, CNRS, Ecole polytechnique, Université Paris-Saclay, 828 Boulevard des Maréchaux, 91762 Palaiseau cedex, France
  • 4Sorbonne Universités, UPMC Université Paris 06, UMR 7614, LCPMR, 75005 Paris, France and CNRS, UMR 7614, LCPMR, 75005 Paris, France
  • 5CEA-Saclay, IRAMIS/LIDyL, 91191 Gif-sur-Yvette, France

  • *Corresponding author: sustrem@gmail.com

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Issue

Vol. 94, Iss. 1 — July 2016

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