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Reduction of photodarkening in Yb/Al-doped fiber lasers
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
Responsible organisation
2008 (English)In: Fiber Lasers V: Technology, Systems, and Applications, SPIE - International Society for Optical Engineering, 2008, U269-U276 p.Conference paper, (Refereed)
Abstract [en]

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 915nm 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.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2008. U269-U276 p.
Series
PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS, ISSN 0277-786X ; 6873
Keyword [en]
Ytterbium, valence stability, photodarkening; ytterbium; fiber lasers; charge-transfer
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-5974DOI: 10.1117/12.763218ISI: 000255547100041Local ID: 5539ISBN: 978-0-8194-7048-5 (print)OAI: oai:DiVA.org:miun-5974DiVA: diva2:31007
Conference
Conference on Fiber Lasers V, Jan 21-24, 2008, San Jose CA
Available from: 2008-11-19 Created: 2008-11-19 Last updated: 2013-03-25Bibliographically approved
In thesis
1. Materials optimization for optical fiber amplifiers and fiber lasers
Open this publication in new window or tab >>Materials optimization for optical fiber amplifiers and fiber lasers
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Sundvall: Mid Sweden University, 2008. 46 p.
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 50
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-7566 (URN)978-91-85317-93-6 (ISBN)
Public defence
(English)
Supervisors
Available from: 2008-12-10 Created: 2008-12-10 Last updated: 2008-12-10Bibliographically approved

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Engholm, MagnusNorin, Lars
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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
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  • nn-NB
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  • Other locale
More languages
Output format
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  • text
  • asciidoc
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