Cathodoluminescence investigation of Ge-point defects in silica-based optical fibers - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Luminescence Année : 2016

Cathodoluminescence investigation of Ge-point defects in silica-based optical fibers

Sylvain Girard
Antonino Alessi
Diego Di Francesca
Melanie Raine
  • Fonction : Auteur
Aziz Boukenter
Youcef Ouerdane

Résumé

Cathodoluminescence (CL) measurements have been performed on Ge doped and Ge/F co-doped optical fibers, in the aim of studying the spatial distributions of the emitting precursor defects present in the as-drawn optical fiber as well as those of the radiation induced centers generated by the 10 keV electron exposure. Using the CL instrument, we recorded different emission bands located in the visible spectral domain (300–750 nm) as well as CL imaging of associated defects, with a spatial resolution of about 1 µm, along the fiber transverse cross sections. In the pristine fiber, Germanium Lone Pair Centers (GLPCs) emitting at 400 nm are the main precursor sites observed in both fibers. Whereas during electron exposure, these centers are converted into other Ge-related defects. In this paper, we studied in situ their bleaching kinetic using CL monochromatic imaging. As expected, our results show that the GLPC signal decreases with the electron fluence, confirming its precursor role. Thanks to the CL abilities, we also demonstrate that the GLPC conversion into radiation induced defects (and then its bleaching kinetic) depends on the germanium concentration, opening the way to a better control of the radiation sensitivity of germanosilicate glass.
Fichier non déposé

Dates et versions

hal-01528174 , version 1 (27-05-2017)

Identifiants

Citer

Imène Reghioua, Sylvain Girard, Antonino Alessi, Diego Di Francesca, Layla Martin-Samos, et al.. Cathodoluminescence investigation of Ge-point defects in silica-based optical fibers. Journal of Luminescence, 2016, 179, pp. 1-7. ⟨10.1016/j.jlumin.2016.06.041⟩. ⟨hal-01528174⟩
32 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More