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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 22 — Aug. 1, 2010
  • pp: 4139–4143

Photodarkening-induced increase of fiber temperature

Joan J. Montiel i Ponsoda, Mikko J. Söderlund, Jeffrey P. Koplow, Joona J. Koponen, and Seppo Honkanen  »View Author Affiliations


Applied Optics, Vol. 49, Issue 22, pp. 4139-4143 (2010)
http://dx.doi.org/10.1364/AO.49.004139


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Abstract

We examine the effect of photodarkening-induced pump light absorption on Yb-doped fiber thermal loading. In these experiments, the fiber is cladding pumped at 915 nm , air cooled by natural convection, and monitored with a midinfrared thermal camera. The fiber temperature is found to correlate with progressive photodarkening. The maximum observed fiber temperature was 120 ° C , recorded at a pump power of 10.5 W . The observed increase in fiber temperature can be explained by a model that takes into account the combined effects of the Yb-silica quantum defect, the temperature dependence of the Yb-absorption cross section, and photodarkening-induced loss at 915 nm . We hypothesize that the latter effect results in the progressive activation of temperature-dependent photochemical processes (e.g., bleaching) and is an important consideration with regard to the accurate modeling of Yb-doped fiber photodarkening kinetics.

© 2010 Optical Society of America

OCIS Codes
(140.3510) Lasers and laser optics : Lasers, fiber
(140.6810) Lasers and laser optics : Thermal effects
(160.5690) Materials : Rare-earth-doped materials
(140.3615) Lasers and laser optics : Lasers, ytterbium

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: May 26, 2010
Manuscript Accepted: June 18, 2010
Published: July 22, 2010

Citation
Joan J. Montiel i Ponsoda, Mikko J. Söderlund, Jeffrey P. Koplow, Joona J. Koponen, and Seppo Honkanen, "Photodarkening-induced increase of fiber temperature," Appl. Opt. 49, 4139-4143 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-22-4139

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