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Proceedings Paper

Reduction of photodarkening in Yb/Al-doped fiber lasers
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Paper Abstract

A strong charge-transfer band at UV-wavelengths is found to play a major role for the observed induced optical losses (photodarkening) in ytterbium doped high-power fiber lasers. This is correlated to the valence stability of the ytterbium ion in the silicate glass matrix, which we believe is the origin of photodarkening. We have performed UV-irradiation experiments on ytterbium-doped preform samples and accelerated photodarkening experiments on Yb-doped fibers, by using 915 nm high power diodes. Our results show that photodarkening can be reduced, to low levels, either by preparing the preform glass in a reducing atmosphere or by hydrogen loading the fiber in a pressure chamber at room temperature.

Paper Details

Date Published: 25 February 2008
PDF: 8 pages
Proc. SPIE 6873, Fiber Lasers V: Technology, Systems, and Applications, 68731E (25 February 2008); doi: 10.1117/12.763218
Show Author Affiliations
Magnus Engholm, Mid-Sweden Univ. (Sweden)
Acreo FiberLab (Sweden)
Lars Norin, Acreo FiberLab (Sweden)

Published in SPIE Proceedings Vol. 6873:
Fiber Lasers V: Technology, Systems, and Applications
Jes Broeng; Clifford Headley, Editor(s)

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