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Modélisation de la Physique Atomique et du Transfert Radiatif pour le laser X-UV

Abstract : The X-UV laser sources have been experiencing important development for about ten years. In this spectral range, we are now able to produce highly coherent and intense collimated sources which could have applications in medical imaging, photolithography, or for the diagnostic of dense plasmas... This thesis was dedicated to the modeling of the "OFI" X-UV laser, studied in the LOA (ENSTA, Palaiseau). This type of X-ray laser is generated following the ionization of a gas (Kr, Xe) by a high power infrared laser. The plasma generated by this interaction constitutes the X-UV source. The work produced during the thesis was about the amplification of an X-UV radiation injected in the plasma. Its purpose was to provide a more detailled analysis of spatio-temporal profile of the signal. Hence a new 3D numeric code has been developed. It uses a radiative transfer model including the Maxwell-Bloch equations. On the first hand, the results show that the temporal profile of the X-UV signal changes significantly during the amplification. For example, it can reveal very short intensity peaks (<100fs) at high saturation. As the latter can only be obtained with a plasma of several centimeters long, the experimental scheme using the guiding of the infrared laser has to be considered because it leads to the creation of such plasmas. On the other hand, the analysis of the transverse profile of the X-UV signal at the exit of the plasma demonstrated that the plasma amplifier acts as spatial filter of the injected X-UV laser pulse.
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https://tel.archives-ouvertes.fr/tel-00576536
Contributor : Bruno Robillart <>
Submitted on : Monday, March 14, 2011 - 3:56:52 PM
Last modification on : Friday, October 16, 2020 - 3:41:05 AM
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Bruno Robillart. Modélisation de la Physique Atomique et du Transfert Radiatif pour le laser X-UV. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2010. Français. ⟨tel-00576536⟩

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