Combinaison cohérente de lasers à fibre : étude en régime impulsionnel et mise en phase d'un grand nombre d'émetteurs

Abstract : A great interest exists for fibre lasers in all domains, from medical to telecommunication applications, as they enable to achieve a good spatial and spectral coherence and they are compact and robust. The limit comes from high-power applications. The combination of several laser sources is therefore a solution to overcome the limitations of individual emitter, especially coherent combining techniques. In this combination form, the active phase control by frequency tagging technique looks the most promising one, but two main limitations were identified : the pulse regime and the limited number of channels, which can be phase-locked. In this thesis, solutions are proposed to overcome these limitations. At first, we realised the first experimental demonstration of a pulse coherent combination using this technique. Then by adapting orthogonal coding tehniques from the telecommunication domain, we increased the number of channels which can be combined. A simulation tool was developped to study the coding techniques as well as the propagation of the beams through a turbulent atmosphere. To evaluate the performances of systems with a large number of emitters, we developped a methodology based on the use of numerical designs of experiments and metaodels, enabling us to identify the most influent fibres or interactions between fibres, as a function of the initial parameters of the combination.
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Adrian Azarian. Combinaison cohérente de lasers à fibre : étude en régime impulsionnel et mise en phase d'un grand nombre d'émetteurs. Autre. Télécom ParisTech, 2012. Français. ⟨NNT : 2012ENST0063⟩. ⟨pastel-00850646⟩

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