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TitleUnderstanding the fiber tip thermal runaway present in 3 µm fluoride glass fiber lasers.
Publication TypeJournal Article
Year of Publication2012
AuthorsCaron, Nicolas, Martin Bernier, Dominic Faucher, and Réal Vallée
JournalOpt Express
Date Published2012 Sep 24
KeywordsComputer Simulation, Computer-Aided Design, Equipment Design, Equipment Failure Analysis, Fiber Optic Technology, Fluorides, Glass, Hot Temperature, Lasers, Models, Chemical, Thermal Conductivity

When the tip of a fluoride glass fiber is exposed to ambient air, water vapor reacts with the glass constituents, increasing the OH contaminants at the surface. These OH impurities then diffuse inside the glass according to Fick's laws. Laser radiation at around 3 µm is strongly absorbed by the OH contaminants, causing local heating of the fiber tip resulting in an increase of the diffusion process which ultimately leads to fiber tip destruction. We accurately model this phenomenon by combining the diffusion theory with a basic thermal equation. Experimental measurements are in agreement with the model predictions for a good range of operating conditions.

Alternate JournalOpt Express
PubMed ID23037367