Abstract
This Letter relates the clear evidence of formation under 2.5 MeV electron irradiation in optical fiber preforms showing a darkening of the core. We thus detected by in situ photoluminescence measurements the green emission of divalent under the 355 nm excitation. Moreover, we showed the existence of two types of ion species with different stabilities. We demonstrated that the radiodarkening mechanism is based on a pair association of with aluminum oxygen hole center point defects.
© 2016 Optical Society of America
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