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Etude de la dépendance temporelle de l’endommagement laser de matériaux diélectriques à 1054 nm en régime sub-picoseconde et picoseconde.

Abstract : Located in CEA-CESTA, the laser facility PETAL (PETawatt Aquitaine Laser) delivers sub-picosecond to picosecond pulses with peak powers of the order of magnitude of one Petawatt. In order for this large facility to fulfill its potential with the generation of multi-petawatt pulses, the study of the laser damage occurring on dielectric mirrors at the end of PETAL chain is necessary as this phenomenon limits the energy available. Using the laser testing bench DERIC, this thesis deals specifically with the study of the temporal dependency of laser damage for dielectric mirrors irradiated by sub-picosecond or picosecond pulses. We thus tackle intrinsic laser damage, defect initiated laser damage and laser damage growth. By confronting experiments and simulations, we show that the temporal dependency of intrinsic damage is not fully explainable with the pulse duration alone but by taking into account the whole temporal profile of the pulse. In particular, this has important consequences on the concept of temporal scaling law of the Laser Induced Damage Threshold (LIDT) of dielectric components, a tool largely used by the laser damage community as a LIDT prediction means. Thanks to this study and by taking into account the high electric field modulations caused by a nodular defect within a dielectric mirror, we then bring answers to the temporal dependency of defect initiated damage. About damage growth, we lastly establish, thanks to an experimental and numerical parametric study, an empirical growth law which takes into account the fluence, the pulse duration and the electric field modulations generated by any initial damage prior to its growth.
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Submitted on : Tuesday, May 12, 2020 - 11:57:11 AM
Last modification on : Wednesday, June 24, 2020 - 11:58:11 AM

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Alexandre Ollé. Etude de la dépendance temporelle de l’endommagement laser de matériaux diélectriques à 1054 nm en régime sub-picoseconde et picoseconde.. Optique [physics.optics]. Ecole Centrale Marseille, 2020. Français. ⟨NNT : 2020ECDM0001⟩. ⟨tel-02570707⟩

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