BENEFITS OF THE THERMALLY STIMULATED LUMINESCENCE IN THE STUDY OF RADIATION-INDUCED COLOUR CENTRES IN YTTERBIUM-DOPED SILICA-BASED OPTICAL FIBRES

International audienceBy considering samples of ytterbium-doped silica glass from fibre preforms, we will show how TSL allows direct comparison between colour centres created by X-ray, UV light (at several wavelengths) and by the visible radiation of an Ar+ ion laser. This comparison will lead us to propose plausible darkening mechanisms with related models