We investigated point defects induced in rad-hard Fluorine-doped optical ﬁbers using both a mixed source of neutrons (ﬂuences from 1015 to 1017 n/cm2) and γ-rays (doses from 0.02 to 2 MGy) and by a γ-ray source (dose up to 10 MGy). By combining several complementary spectroscopic techniques such as radiation-induced attenuation, confocal micro-luminescence, time-resolved photo-luminescence and electron paramagnetic resonance, we evidenced intrinsic and hydrogen-related defects. The comparison between the two irradiation sources highlightsclose similarities among the spectroscopic properties of the induced defects and the linear correlation of their concentration up to 1016 n/cm2. These results are interpreted on the basis of the generation processes of defects from precursors sites, that are common to both γ-rays and neutrons. In contrast, the highest neutron ﬂuence (1017 n/cm2) causes peculiar effects, such as the growth of a photoluminescence and variations of the spectral and decay properties of the emission related with nonbridging oxygen hole centers, that are likely due to silica network modiﬁcation.
|Numero di pagine||14|
|Rivista||Optical Materials Express|
|Stato di pubblicazione||Published - 2015|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
Morana, A., Cannas, M., Boscaino, R., Nacir, Morana, Girard, Macé, Paillet, Boukenter, Ouerdane, Marcandella, Périsse, & Marin (2015). Influence of neutron and gamma-ray irradiations on rad-hard optical fiber. Optical Materials Express, 5, 898-911.