VERMILLAC , Manuel

The development of new silica-based optical fibers is relies on the insertion of luminescent ions (rare-earth ions) in dielectric nanoparticles. In this context, particle size is a key parameter that should be controlled in order to benefit from the new properties. To reach this goal, the objective of this thesis was twofold. Firstly, it was...

Les lasers à fibres émettant à de nouvelles longueurs d'ondes sont développés pour différentes applications (médicales, industrielles, capteurs,....). Dans cette communication, nous nous intéressons aux différentes transitions issues du thulium (Tm 3+) lors d'un pompage à 1,07 µm dans une fibre alumino-silicate. Des mesures de spectres de...

LaF3 is commonly added to oxide glass, in particular to silica, to form oxyfluoride glass. After appropriate thermal treatment at a temperature lower than 800 °C, usually, glass ceramics are obtained. Recently, LaF3 nanoparticles have been used as precursors to obtain amorphous nanoparticles of undefined composition in optical fiber. However,...

Improving optical fiber amplifiers requires the elaboration and use of new materials and new compositions. In this sense, we prepared erbium-doped optical fiber samples that were co-doped with magnesium or lanthanum by gradual-time solution doping. Doping concentrations and thermal processes induce the formation of nanoparticles. The effect of...

International audience

International audience

International audience

International audience

International audience

For years, scientists have been looking for different techniques to make glasses perfect: fully amorphous and ideally homogeneous. Meanwhile, recent advances in the development of particle-containing glasses (PCG), defined in this paper as glass-ceramics, glasses doped with metallic nanoparticles, and phase-separated glasses show that these...

International audience

Standard MCVD process and solution doping are commonly used for processing rare-earth doped optical fibers. Since the 1970s, this technique is mainly employed to fabricate homogeneous preforms in the longitudinal direction. A variant is proposed here, by using two doping solutions and by applying a gradual time doping. To demonstrate the...

International audience

International audience

Optical fibers form the basis for a wide range of applications that have grown considerably in technological impact recently, such as telecommunications, sensors, and lasers. These applications rely on the remarkable qualities of silica glass; particularly its significant mechanical and chemical stability, high optical damage threshold, low...

International audience

Optical, structural properties and redox were studied for Ce-bearing silicate and aluminosilicate glasses and Ce-activated silica (SiO2) fiber preforms, by X-ray Absorption, Raman and Photoluminescence Spectroscopy. The introduction of Al2O3 in Ce-bearing silicate glass strongly stabilizes reduced species in agreement with the optical basicity...

Photo-darkening prevents developing of new applications of rare-earth doped silica fibre lasers or amplifiers operating at wavelengths shorter than 1 mm or at any wavelength at high power. The photo-darkening is characterized by a decrease of the laser intensity during amplification. In this article, we are interested in Tm-doped fibres. This...

By pumping thulium-doped silica-based fibers at 1.07~\mu m, rapid generation of absorbing centers leads to photo-induced attenuation (PIA). This detrimental effect prevents exploiting laser emissions in the visible and near infrared. We report on the characterization of the PIA versus the fiber core composition, particularly the concentration...

National audience

RÉSUMÉ Les fibres optiques dopées au thulium pompées à 1,07 µm offrent la perspective de lasers et amplificateurs fonctionnant à de nouvelles longueurs d'onde. Ce système permet d'envisager de nombreuses transitions optiques encore inexploitées dans des fibres à base de silice. Le principal verrou technologique de ce système est le...

National audience

International audience

Nanoparticles in the core of optical fibres are widely studied due to the opportunity they give to tailor spectroscopic properties. Such fibres are usually obtained by drawing at high temperature a preform containing nanoparticles. This study focuses on the effect of the fibre drawing on nanoparticles. We fabricated an MCVD optical preform by...

Particles in the core of optical fibers are widely studied to tailor or to improve optical properties. The analysis of nanoparticles embedded in silica-based optical fiber allowed new observations of the evolution of amorphous particles during fiber drawing. Even at the nanoscale, competition between viscous stresses and surface tension on the...