In this work we investigated the point defects at the origin ofthe degradation of radiation-tolerant optical fibers used in the visible partof the spectrum for plasma diagnostics in radiation environments. For thisaim, the effects of γ -ray irradiation up to the dose of 10 MGy(SiO2) andpost-irradiation thermal annealing at 550◦C were studied for a Fluorinedopedfiber. An absorption peaking around 2 eV is mainly responsible forthe measured radiation-induced losses, its origin being currently debated inthe literature. On the basis of the unchanging shape of this band with theradiation dose, its correlation with the 1.9 eV photoluminescent band andthe thermal treatment results we assign the asymmetric absorption around 2eV to an unique defect, the NBOHC, instead of a set of various defects.
|Numero di pagine||8|
|Rivista||Optical Materials Express|
|Stato di pubblicazione||Published - 2013|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials