Abstract

Molecular hydrogen loading and a subsequent 193-nm ultraviolet (UV) irradiation influence on the gain properties of ${\rm{Er}}^{3 + }$-doped core silica optical fibers are demonstrated in this work. The dynamics of photoinduced changes’ formation and subsequent dissociation in this fiber type is demonstrated. $\rm{H}_2$ loading results in less than a 10% fiber-gain decrease, whereas subsequent UV irradiation results in almost twice the gain degradation. Furthermore, UV-induced defects partially dissociate under the influence of 976-nm pump radiation. At least two independent types of gain degradation mechanisms of $\rm{H}_2$-loaded active fiber under the influence of UV irradiation are shown.

© 2019 Optical Society of America

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