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Moyen de métrologie pour la conception et l’évaluation de chaines lasers hyper intenses utilisant la recombinaison cohérente de lasers élémentaires

Abstract : The need for the rise in power, peak and medium, of hyper intense laser chains has led to the emergence of a new type of architecture. The principle is to consistently combine a large number of the simplest and most robust elementary lasers possible. The difficulty of ramping up is therefore mainly transferred to the recombination system. Several laboratories around the world have thus decided to get involved in this path. If there are various concepts for the servo loop, there is currently, to our knowledge, no development of a means of absolute metrology of the quality of the final wavefront, and therefore of recombination. This is fundamental for two particular moments in the design of these new architectures.First, it is necessary to know the nature, amplitude and frequency of open loop phase faults in order to properly specify the optical head architecture and the control/command system. Then, when the chain is fully operational, in closed loop, the quality of the recombination must be evaluated. The purpose of this thesis is to propose a new interferometer adapted to these two needs, i.e. capable of withstanding strong dynamics and at the same time having absolute measurement capabilities of very high precision and accuracy, at high cadence, in order to measure and analyze the wavefront resulting from the combination of the different lasers over the entire design phase of these lasers, in open loop as in closed loop.
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https://tel.archives-ouvertes.fr/tel-01943710
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Submitted on : Tuesday, December 4, 2018 - 10:15:30 AM
Last modification on : Wednesday, October 14, 2020 - 3:40:38 AM
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Maxime Deprez. Moyen de métrologie pour la conception et l’évaluation de chaines lasers hyper intenses utilisant la recombinaison cohérente de lasers élémentaires. Optique [physics.optics]. Université Paris Saclay (COmUE), 2018. Français. ⟨NNT : 2018SACLS241⟩. ⟨tel-01943710⟩

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