Abstract

This Letter relates the clear evidence of ${\mathrm{Yb}}^{2+}$ 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 ${\mathrm{Yb}}^{2+}$ under the 355 nm excitation. Moreover, we showed the existence of two types of ${\mathrm{Yb}}^{2+}$ ion species with different stabilities. We demonstrated that the radiodarkening mechanism is based on a pair association of ${\mathrm{Yb}}^{2+}$ with aluminum oxygen hole center point defects.

© 2016 Optical Society of America

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