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

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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Article dans une revue
Physical Review A, American Physical Society, 2016, 94, pp.013855. 〈10.1103/PhysRevA.94.013855〉
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https://hal-cea.archives-ouvertes.fr/cea-01426406
Contributeur : Caroline Lebe <>
Soumis le : mercredi 4 janvier 2017 - 14:48:54
Dernière modification le : vendredi 31 août 2018 - 09:11:07

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S. Stremoukhov, A. Andreev, Boris Vodungbo, P. Salières, B. Mahieu, et al.. Origin of ellipticity of high-order harmonics generated by a two-color laser field in the cross-polarized configuration. Physical Review A, American Physical Society, 2016, 94, pp.013855. 〈10.1103/PhysRevA.94.013855〉. 〈cea-01426406〉

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