Abstract

We propose a theoretical model for a laser cooled continuous-wave fiber amplifier. The amplification process takes place in the Yb³⁺-doped core of a fluoride ZBLAN (ZrF₄-BaF₂-LaF₃-AlF₃-NaF) glass fiber, while the cooling process takes place in the cladding, which is doped with thulium. It is shown that for each value of the pump power and amplified signal there is an optimum distribution of the concentration of the Tm³⁺ along the length of the fiber amplifier, which provides optimum athermal operation. The influence of a small deviation in the input signal power on the temperature of the fiber with a fixed distribution of the Tm³⁺ ions in the fiber cladding is investigated.

© 2009 Optical Society of America

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History
Original Manuscript: August 13, 2009
Manuscript Accepted: September 21, 2009
Revised Manuscript: September 20, 2009
Published: November 3, 2009

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Author Affiliations

Galina Nemova, Raman Kashyap

Department of Engineering Physics, École Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montréal H3C 3A7, Canada

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