Heat-induced darkening and spectral broadening in photodarkened ytterbium-doped fiber under thermal cycling

We study thermal bleaching of photodarkening-induced loss in a 20-microm core diameter, large-mode-area ytterbium-doped silica fiber. Pristine and photodarkened samples are subjected to thermal cycling pulses. Recovery of the photodarkened fiber absorption coefficient initiates at approximately 350...

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Bibliographic Details
Published in:Optics express 2009-06, Vol.17 (12), p.9940-9946
Main Authors: Söderlund, Mikko J, Montiel i Ponsoda, Joan J, Koplow, Jeffrey P, Honkanen, Seppo
Format: Article
Language:English
Subjects:
Computer-Aided Design
Equipment Design
Equipment Failure Analysis
Hot Temperature
Optical Fibers
Photons
Reproducibility of Results
Sensitivity and Specificity
Silicon Dioxide - chemistry
Spectrum Analysis - instrumentation
Ytterbium - chemistry
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Summary:We study thermal bleaching of photodarkening-induced loss in a 20-microm core diameter, large-mode-area ytterbium-doped silica fiber. Pristine and photodarkened samples are subjected to thermal cycling pulses. Recovery of the photodarkened fiber absorption coefficient initiates at approximately 350 degrees C and complete recovery is reached at approximately 625 degrees C. However, prior to recovery, the photodarkened fiber exhibits further heat-induced increase of absorption loss. This increase of loss is attributed to both a permanent increase of loss-inducing color centers and a temperature-dependent broadening of the absorption spectrum. Post-irradiation heat-induced formation of color centers suggests the presence of an intermediate energy state in the near-infrared photochemical mechanism for photodarkening.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.17.009940