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Etude du lasage transverse dans les cristaux de Ti : Sa de grandes dimensions. Application à la réalisation de l'amplificateur petawatt haute énergie du laser pilote de la station LASERIX

Abstract : This manuscript presents experimental and theoretical works accomplished for the development of the LASERIX laser driver. The main goal of this thesis work was to design a high energy and high repetition rate titanium doped sapphire amplifier (Ti:Sa) allowing to reach an energy of 40J at a repetition rate of 0.1Hz before compression.
After a general description of amplification in chirped pulse amplification Ti:Sa laser systems (Chapter 1), I present the two particular developments we made during this work for high energy amplification (Chapter 2) :
- The spatial shaping and the homogenization based on microlens array (MLA) systems of the eight Nd-Glass pump lasers dedicated to the pumping of the last booster amplifier.
- The suppression of parasitic effects due to transverse amplification of the fluorescence in the last booster amplifier Ti:Sa crystal.
The developments performed as part of this thesis allowed to amplify an impulsion of 2J of energy up 39J in a crystal of 10cm diameter.
I also present the simulation program I developed (Chapter 3) in order to modelize the three dimensional parasitic lasing effect and fluorescence transverse amplification phenomena in large Ti:Sa crystals. A parametric study of these parasitic effects is also presented.
Finally, the last part of this manuscript (Chapter 4) gives prospects of this work as part of the large future ELI and ILE projects.
Keywords : Station Laserix
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Submitted on : Monday, May 26, 2008 - 3:25:25 PM
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Fabien Ple. Etude du lasage transverse dans les cristaux de Ti : Sa de grandes dimensions. Application à la réalisation de l'amplificateur petawatt haute énergie du laser pilote de la station LASERIX. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2007. Français. ⟨tel-00282137⟩

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