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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https://hal-ensta-paris.archives-ouvertes.fr//hal-01818789
Contributor : Pierre Zaparucha <>
Submitted on : Tuesday, June 19, 2018 - 3:26:05 PM
Last modification on : Wednesday, September 4, 2019 - 5:36:03 PM

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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, American Physical Society, 2018, 97 (4), ⟨10.1103/PhysRevA.97.043857⟩. ⟨hal-01818789⟩

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