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Lasers femtosecondes SWIR-MIR à fibres optiques pour la génération de rayonnements secondaires de l’EUV au MIR

Abstract : The interaction between selfphase modulation and chromaticdispersion allows the installation of the solitonic regime, a solution of Schrödinger's equation in non-linear regime. In the case of subpicosecond impulses filling the condition of existence of the fundamental soliton, their largespectral bandwidth exposes them to 3rd order dispersion and Raman susceptibility. The interaction of these phenomena leads to soliton self-frequency shift. Solitonic fission and soliton self-frequency shift allow the generation of near 100 fs tunable wavelength pulses. The problem of the thesis can be summarized by the use of this phenomenon to develop high peak power sourcesat wavelengths, between 2 and 3 μm, not covered by MOPA and MOFA lasers. The design of fibres with a large modal area was necessary in order to achieve high peak power sources in the transparency band of silica. The study of the different fibres transparent in the mid-infrared was necessary as well as their integration in a MOFA sourcefor the conceptionof sources in the range [2,4;3] μm. The mastery of the solitonic regime properties allowedusthe generation of pulses of peak power close to and above MWin flexible fibres with a solid core (0.8MW to 1.7μm and 2.8MW to 2.2μm). Another result wasthe generation of soliton via a monolithic laser at wavelengths poorly covered>2.4 μm with peak powers (35kW to 2.75μm, 9kW to 3.01μm).
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Hugo Delahaye. Lasers femtosecondes SWIR-MIR à fibres optiques pour la génération de rayonnements secondaires de l’EUV au MIR. Optique / photonique. Université de Limoges, 2020. Français. ⟨NNT : 2020LIMO0064⟩. ⟨tel-03129241⟩

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