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Opt Express. 2013 Mar 25;21(6):6681-8. doi: 10.1364/OE.21.006681.

Experimental evidence for the formation of divalent ytterbium in the photodarkening process of Yb-doped fiber lasers.

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Mid Sweden University, S-851 70 Sundsvall, Sweden.


In this work we present experimental evidence that the valence instability of the ytterbium ion play a key role for the observed photodarkening mechanism in Yb-doped fiber lasers. Luminescence and excitation spectroscopy performed on UV irradiated Yb/Al doped silica glass preforms and near-infrared diode pumped photodarkened fibers show a concentration increase of Yb(2+) ions. A concentration decrease in Yb(3+) could also be observed for the UV irradiated preform. The findings contribute to an increased understanding of the kinetic processes related to photodarkening in Yb-doped high power fiber lasers.

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