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Étude de la transition de phase ultra rapide solide/liquide d'un semi conducteur par diffraction X femtoseconde

Abstract : This PhD dissertation is related to a new field of research : the ultrafast X ray science. The research carried out in the field of high intensity lasers as well as accelerators (synchrotrons) communities has lead to the development of a new generation of tools associated to X ray radiation, the ultrafast X ray sources. These new sources with a time duration of 100 fs (1 fs = 10e-15 s) should have a great impact in the study of time resolved atomic dynamics, breaking the present synchrotrons limitation of several tens of picoseconds (1 ps = 10e-12 s). This thesis presents the first application of an ultrashort X ray source produced by the interaction of an intense laser beam with a solid target (laser plasma X ray source). The phase transition (solid/liquid) in a semiconductor has been observed and characterised by time resolved X-ray diffraction. The analysis of the experimental results has been made with a simple model of the laser semiconductor interaction including an extrapolation of the Drude model to the high carrier density regime (10e22 /cm3).
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https://pastel.archives-ouvertes.fr/pastel-00612715
Contributor : Sylvain Fourmaux <>
Submitted on : Saturday, July 30, 2011 - 5:42:03 AM
Last modification on : Wednesday, July 3, 2019 - 10:48:02 AM

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  • HAL Id : pastel-00612715, version 1

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Sylvain Fourmaux. Étude de la transition de phase ultra rapide solide/liquide d'un semi conducteur par diffraction X femtoseconde. Physique des plasmas [physics.plasm-ph]. Ecole Polytechnique X, 2002. Français. ⟨pastel-00612715⟩

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