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

S. Stremoukhov; A. Andreev; Boris Vodungbo; P. Salières; B. Mahieu; Guillaume Lambert

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

S. Stremoukhov ¹ A. Andreev ¹ Boris Vodungbo ^{2, 3, 4} P. Salières ^{5, 6} B. Mahieu ² Guillaume Lambert ²

1 Faculty of Physics [MSU, Moscow]

2 LOA - Laboratoire d'optique appliquée

3 Sorbonne Universités

4 LCPMR - Laboratoire de Chimie Physique - Matière et Rayonnement

5 LIDyl - Laboratoire Interactions, Dynamique et Lasers (ex SPAM)

6 ATTO - Attophysique

IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamique et Lasers (ex SPAM)

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.

Document type :

Journal articles

Domain :

Physics [physics]

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https://hal-cea.archives-ouvertes.fr/cea-01426406
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Submitted on : Wednesday, January 4, 2017 - 2:48:54 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:03 AM

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

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

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