Fibres optiques vitrocéramiques pour application laser

Abstract : This thesis focuses on the development of core/clad type optical fibers where the core is composed of transparent glass ceramics. The system considered was composed of a silica matrix where ZnGa2O4 nanocrystals can be stabilized. Those crystals can interestingly be doped with transition metal ions such as chromium (III) or nickel (II) ions. The precursor glass were synthetized by melt quenching method, drawn into fibers through the powder in tube process, and subsequently annealed to produce optically active glass ceramic optical fibers. The starting glass composition together with the drawing parameters, the fiber core composition and the annealing protocol were optimized in order to maximize the luminescence properties around 700 nm and 1350 nm in chromium (III) and nickel (II) doped fibers respectively. Such type of fibers are interesting for the domains of optical thermometry, fibered sources, amplifiers and lasers. In particular, we demonstrated that the emission spectrum around 1350 nm of nickel (II) doped glass ceramic fibers exhibited a full width at half maximum above 270 nm, wider than that of 1300 nm centered commercial sources. The overall power outcome is about thirty micro watts, which is almost suitable for OCT applications. Further developments aiming at reducing the optical losses in the fibers and in maximizing the dopant efficiency will allow to reach the applications requirements. Those promising results led to a patent application on the fibers composition and their fabrication process.
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Damien Pomarede. Fibres optiques vitrocéramiques pour application laser. Optique / photonique. Université de Limoges, 2018. Français. ⟨NNT : 2018LIMO0019⟩. ⟨tel-01793286⟩

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