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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 22 — Oct. 29, 2007
  • pp: 14838–14843

Photodarkening in Yb doped fibers: experimental evidence of equilibrium states depending on the pump power

Sylvia Jetschke, Sonja Unger, Ulrich Röpke, and Johannes Kirchhof  »View Author Affiliations


Optics Express, Vol. 15, Issue 22, pp. 14838-14843 (2007)
http://dx.doi.org/10.1364/OE.15.014838


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Abstract

Photodarkening in Yb doped fibers was examined at 633 nm in-situ during cladding pumping at 915 nm with varying pump powers and with no indication of an onset threshold. For the first time, the partial bleaching of the photodarkening loss by the pump power itself was observed. We found the relaxation to well-defined equilibrium states of the core excess loss, depending on the Yb inversion. From the dependence of the measured rate constant on the density of excited Yb ions we conclude, that on average 3 to 4 excited Yb ions create or bleach one color center responsible for the core excess loss.

© 2007 Optical Society of America

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(160.2290) Materials : Fiber materials
(160.5690) Materials : Rare-earth-doped materials

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: August 27, 2007
Revised Manuscript: October 24, 2007
Manuscript Accepted: October 24, 2007
Published: October 25, 2007

Citation
Sylvia Jetschke, Sonja Unger, Ulrich Röpke, and Johannes Kirchhof, "Photodarkening in Yb doped fibers: experimental evidence of equilibrium states depending on the pump power," Opt. Express 15, 14838-14843 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-22-14838


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References

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