BIDAULT , Xavier

A simple transferable adaptive model is developed and it allows for the first time to simulate by Molecular Dynamics the separation of large phases in the MgO-SiO 2 binary system, as experimentally observed and as predicted by the phase diagram, meaning that separated phases have various compositions. This is a real improvement over...

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New rare-earth ion-doped optical fibres stand for potential applications in telecommunications, sensors, fibre lasers. Although silica-based optical fibres present attractive physical and economical properties as glass host, spectroscopic limitations appears when rare-earth ions are inserted in silica, such as clustering or inappropriate local...

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Cette étude révèle un nouvel aspect sur la structure de la silice à l'échelle nanométrique. L'orientation acquise par les petits anneaux (Si-O) n pour n ≤ 5 suite à la déformation à chaud persiste à froid et induit une anisotropie structurale dont la forme « isotropie transverse » est vérifiée par spectrométrie Raman.

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A novel aspect of the medium-range structure of silica drawn into fibers is studied. The network of silica glass structure is composed of corner-shared SiO 4 tetrahedra, and it can be seen as a structure of interconnected rings (Si-O) n of various size, denoted nMR (n-Membered Ring). Molecular Dynamics simulations show that small-sized silica...

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Rare earth (RE) doped silica-based optical fibres with transparent glass ceramic (TGC) core were fabricated through the well-known modified chemical vapor deposition (MCVD) process without going through the commonly used stage of post-ceramming. The main characteristics of the RE-doped dielectric nanoparticles (DNP), their density and mean...

Rare earth (RE) doped silica-based optical fibres with transparent glass ceramic (TGC) core were fabricated through the well-known modified chemical vapor deposition (MCVD) process without going through the commonly used stage of postceramming. The main characteristics of the RE-doped dielectric nanoparticles (DNP), their density and mean...

We report on using nanometric mass spectroscopy and molecular dynamics modelling to characterize the composition and structure of self-grown erbium-doped nanoparticles in transparent glass ceramic optical fibres fabricated by modified chemical vapour deposition without post-ceramming.

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A Molecular Dynamics study of rare-earth doped Mg-silicate nanoparticles in vitreous silica: from the preform to the fiber. New lasers and amplifiers still require an enhancement of the spectroscopic performance of rare-earth-doped silica optical fibers. In order to tailor their optical behavior, a route of interest consists in embedding...

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