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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Submitted on : Wednesday, January 4, 2017 - 2:48:54 PM
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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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