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Optical Engineering

Influence of cross-sectional shape on absorption characteristics of double-clad fiber lasers
Author(s): Jianqiu Xu; Junhua Lu; Jianren Lu; Ken-ichi Ueda
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Paper Abstract

The influence of the cross-sectional shape of the inner cladding on the absorption characteristics of double-clad fiber lasers has been investigated by wave coupling theory. Wave equations are solved taking into account mode coupling effects between eigenmodes. The coupling between eigenmodes arises from the nonuniform absorption in the doped core region and leads to nonexponential absorption of the pump power. A characteristic parameter is proposed to compare the absorption characteristics among various cross-sectional shapes of double-clad fibers. It is found that a triangular cross section has the best absorption characteristics among the cross-sectional shapes examined.

Paper Details

Date Published: 1 September 2003
PDF: 7 pages
Opt. Eng. 42(9) doi: 10.1117/1.1593662
Published in: Optical Engineering Volume 42, Issue 9
Show Author Affiliations
Jianqiu Xu, Heriot-Watt Univ. (United Kingdom)
Junhua Lu, Univ. of Electro-Communications (Japan)
Jianren Lu, Univ. of Electro-Communications (Japan)
Ken-ichi Ueda, Univ. of Electro-Communications (Japan)

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