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Etude expérimentale et numérique de la distribution d'intensité laser dans un plasma, et de son influence sur la diffusion Brillouin stimulée

Abstract : The propagation of an intense laser beam trough a preformed plasma is of particular interest in order to achieve laser inertial confinement fusion. Experiments carried out with a near-diffraction limited laser beam, producing a single hot spot interacting with the plasma, delivered new results, presented in this Ph.D. dissertation. In particular the first experimental observation of the filament instability confirms the numerous theoretical and numerical studies on the subject. Beam spreading and filamention thresholds are studied thanks to near-field and far-field images, with respect to laser intensity , time and space, and plasma transverse velocity.

Same diagnostics have been applied to the stimulated Brillouin scattered light, enabling the first observation of the transverse Brillouin
activity in the plasma.
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Contributor : Kevin Lewis <>
Submitted on : Sunday, May 24, 2009 - 10:48:40 AM
Last modification on : Friday, October 23, 2020 - 4:47:52 PM
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  • HAL Id : tel-00387125, version 1

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Kevin Lewis. Etude expérimentale et numérique de la distribution d'intensité laser dans un plasma, et de son influence sur la diffusion Brillouin stimulée. Physique [physics]. Ecole Polytechnique X, 2008. Français. ⟨tel-00387125⟩

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