Leader : Blanc Wilfried
External Collaborators : Chaussedent S., Bidault X. (LPhiA, Angers), Neuville D. (IPGP, Paris), Mehdi A. (ICG, Montpellier), Totterau O., Vennéguès P. (CRHEA, Valbonne), Jurdyc A.-M. (ILM, Villeurbanne), D’Acapito F. (ESRF, Grenoble), Auguste J. L. (XLIM, Limoges), Limberger H. G. (EPFL, Lausanne, Switzerland), Mashinsky V. (FORC, Moscow, Russia)
Technological platforms : Specialty optical fibres manufacture
Developing of new luminescent ions (LI)-doped optical fibres for power amplifiers and lasers requires continuous improvements in the fibre absorption and amplification properties (LI are rare-earth or transition metals ions). Silica glass as a fibre host material has proved to be very attractive. However some potential applications of LI-doped fibres suffer from limitations in terms of spectroscopic properties that may result from clustering and/or inappropriate local environment of LI ions in silica host. To overcome those limitations, the route of interest here consists of embedding the amplifying LI ions within oxide nanoparticles (NP) of composition and structure different from those of silica : this would provide a beneficial local environment to LI ions in terms of their spectroscopic properties.
In this context, we propose a technique which allowed embedding of LI ions within the in-situ grown oxide NP in silica-based preforms prepared by MCVD (modified chemical vapor deposition), and without the need of a ceramming stage. The technique exploits the spontaneous phase separation process in silicate systems when they contain alkaline-earth elements (Mg, Ca, Sr). Two key advantages of this process were that (i) NPs are grown in-situ during the course of the fabrication process and (ii) there is no need (and associated potential risks) for manipulation of NPs by an operator. Further, the process takes advantage of the high compositional control and purity typical of the MCVD technique.
In the frame of a project funded by GDR-Verres (in collaboration with LPhiA-Angers, and IPGP-Paris), growth of nanoparticles is studied through structural and spectroscopic characterizations and numerical simulations based on molecular dynamics. TEM analyses are developed with CRHEA (project COMMET, funded by GIS Azur Opto).
The solution doping technique used in the MCVD process to incorporate alkaline-earth ions limits their concentration to few mol%. To investigate a broader range of composition (to scan the immiscibility region), powder-in-tube process is studied in collaboration with Xlim (project SepPha funded by INSIS (CNRS)).
In the frame of the project "TRANSLUCE" <
MOSAIQ, Fibres Optiques
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