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Auteur / Autrice : Éric Lépine
Direction : Xiang Hua ZhangBruno BureauPierre Lucas
Type : Thèse de doctorat
Discipline(s) : Chimie
Date : Soutenance en 2010
Etablissement(s) : Rennes 1
Ecole(s) doctorale(s) : École doctorale Sciences de la matière (Rennes ; 1996-2016)
Partenaire(s) de recherche : autre partenaire : Université européenne de Bretagne (2007-2016)

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The present work deals with the study of infrared transparent glasses and their applications for sensor use. Their behavior under LASER irradiation, as well as the possibility to modify the surface, and the exploration of new glass compositions has been studied. The deposition of a thin film at the surface of a chalcogenide glass has been realized using two different methods, PVD and sputtering. This led unfortunately to an inhomogeneous surface with PVD. With sputtering we managed to obtain layer of controlled thickness, and by selective etching produce a porous surface. Photo-induced phenomenons have been investigated during this PhD work, especially photo-induced fluidity, on the binary system Ge-Se. The study initiated with the work on relaxation fiber optics of composition Ge-Se3 Ge-Se4 and Ge-Se9 and their response to torsion stress under LASER irradiation on the Urbach region. This lead to the determination of their viscosity under irradiation as a function of the power and wavelength used. This preliminary study enabled us to use these data's for optical tapering of chalcogenide fiber. A tapered fiber was obtained with good control over the diameter , and length of the sensor. Finally, exploration of glassy systems was done, not with chalcogenide system but heavy halide compounds, led to infrared window transmitting from 500 nm to 26 μm, unfortunately their mechanical and thermal properties do not fit the required properties to shape them with the wanted geometry for sensor application.