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Etude de l'endommagement laser de composants réflectifs en régime sub-piscoseconde

Martin Sozet 1, 2 
2 ILM - ILM
FRESNEL - Institut FRESNEL
Abstract : In this thesis, laser-induced damage phenomenon of reflective components is investigated in the sub-picosecond regime. These components, made of stacks of dielectric materials, are widely used in powerful laser facilities such as PETAL laser. PETAL laser has been built at the CEA-CESTA in France to deliver multi-kJ/500fs pulses at 1053nm and reach a power higher than 6PW. For this kind of laser systems, reflective components are commonly used instead of optics operating in transmission to limit the accumulation of non-linear phase along the beam propagation due to the high intensities. Optical components irradiated by the highest power densities are the pulse compression gratings, transport mirrors and the focusing parabola, located at the end of the laser chain. Nowadays, laser-induced damage is the main factor that limits the overall performances of powerful laser systems. This manuscript presents three study axes to better understand and control damage phenomenon. The first one concerns the conception of reflective optics for the petawatt applications. The design of new structures has been investigated to reach high diffraction efficiencies in the case of pulse compression gratings and a high reflectivity in the case of mirrors, while reducing the Electric-field enhancement which is one of the causes of the laser-induced damage. The second axis deals with the development of a precise damage metrology with new testing tools which brings new perspectives and a new viewpoint for the assessment of the laser resistance of optical components. Finally, the third axis concerns the study the damage growth after several irradiations in the sub-picosecond regime. The evolution of the damage area during growth sequences is observed and compared to numerical simulations. It enables to improve the understanding in the growth phenomenon. In the end, these studies will allow to develop predictive models of the laser-induced damage and new tools for the conception of reflective optics for petawatt applications.
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Submitted on : Friday, May 19, 2017 - 12:05:48 PM
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Martin Sozet. Etude de l'endommagement laser de composants réflectifs en régime sub-piscoseconde. Optique [physics.optics]. Ecole Centrale Marseille, 2016. Français. ⟨NNT : 2016ECDM0011⟩. ⟨tel-01525034⟩

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