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Journal Articles Physical Review A : Atomic, molecular, and optical physics [1990-2015] Year : 2018

Control of ellipticity in high-order harmonic generation driven by two linearly polarized fields

Abstract

We demonstrate experimentally the control of the polarization (ellipticity and polarization axis) of femtosecond high-order harmonics. The method relies on a two-color (omega - 2 omega) configuration, where both omega and 2 omega generating fields have linear polarizations with a variable crossing angle. We correlate our measurements with the conservation rules of energy and linear momentum accounting for harmonic generation in a two-color field. We evidence that the generation process, and especially the number of omega and 2 omega photons absorbed for generating a given harmonic, strongly depends on the crossing angle. Finally, relying on a simple formalism, we derive analytical formulae for calculating both polarization axis and ellipticity of the separate harmonics. The model corroborates our results and represents a base for future investigations.
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hal-01818789 , version 1 (19-06-2018)

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B. Mahieu, S. Stremoukhov, D. Gauthier, C. Spezzani, C. Alves, et al.. Control of ellipticity in high-order harmonic generation driven by two linearly polarized fields. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2018, 97 (4), ⟨10.1103/PhysRevA.97.043857⟩. ⟨hal-01818789⟩
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