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Évaluation du potentiel des fibres apériodiques à très large aire modale pour la réalisation de sources laser impulsionnelles

Abstract : These Ph.D work is conducted in the context of a long-term collaboration between Xlim laboratory and the company EOLITE Systems in order to develop new large mode area fibers typically capable of providing up to 200 W of average output power and a peak power of 1 MW while maintaining a transverse single-mode emission at 1030 nm. For that purpose, optical fibers with an aperiodic microstructuration (FA-LPF) were developed in order to improve the performances of commercial fibers, mainly by pushing further the transverse mode instabilities power threshold. An unprecedented experimental study has been conducted to investigate the influence of the fiber structure, the laser source architecture and the mode field diameter. Furthermore, by replacing the commercial fiber by a FA-LPF in an industrial laser prototype, as a proof-of-concept, the FA-LPF permits to obtain a laser source with at least similar properties as those of the laser sources of the company regarding the laser efficiency or the lifetime test. The feasibility of a microstructured fiber shorter and still efficient (50 cm-long), has also been studied, by increasing the ytterbium ions concentration in the FA-LPF core or by improving the core to clad ratio. Finally, a new concept of fiber with a depressed-index core led to core diameters higher than 110 μm while maintaining a transverse single-mode emission.
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Marie-Alicia Malleville. Évaluation du potentiel des fibres apériodiques à très large aire modale pour la réalisation de sources laser impulsionnelles. Optique / photonique. Université de Limoges, 2020. Français. ⟨NNT : 2020LIMO0009⟩. ⟨tel-02520991⟩

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