Journal
OPTICS EXPRESS
Volume 21, Issue 6, Pages 6681-6688Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.006681
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Funding
- Swedish Agency for Economic and Regional Growth
- Fiber Optic Valley
- County Administrative Board in Vasternorrland
- Regional Development Council of Gavleborg
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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 Yb2+ ions. A concentration decrease in Yb3+ 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. (c) 2013 Optical Society of America
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