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Génération d'harmoniques d'ordre élevé à deux faisceaux portant du moment angulaire

Abstract : High-order harmonic generation is a highly nonlinear laser-matter interaction process which allows the synthesis of sub-femtosecond pulses, also called attosecond (1 as = 10⁻¹⁸ s) pulses. My PhD is centered around the study of angular momentum transfer during this process, in order to control spatial and polarization features of the radiation which is emitted in the extreme ultraviolet. As for matter, the angular momentum of light can be divided into a spin component, associated with the beam’s polarization, and an orbital component, related to the shape of the wavefront. The control of high harmonics’ angular momentum requires generating schemes involving two crossing beams, thus creating a diffraction grating in the generating medium.We have shown that, although the transfer rules obey conservation laws of the angular momentum, the fine description of the phenomenon requires an accurate analysis of the laser field in the generation medium. This work opens the road for advanced shaping of attosecond pulses.
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Submitted on : Friday, September 20, 2019 - 11:11:55 AM
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Céline Chappuis. Génération d'harmoniques d'ordre élevé à deux faisceaux portant du moment angulaire. Optique [physics.optics]. Université Paris Saclay (COmUE), 2019. Français. ⟨NNT : 2019SACLS022⟩. ⟨tel-02292788⟩

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