Influence of cross-sectional shape on absorption characteristics of double-clad fiber lasers

Jianqiu Xu, Junhua Lu, Jianren Lu, K. Ueda

Research output: Contribution to journalArticle

10 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)2527-2533
Number of pages7
JournalOptical Engineering
Volume42
Issue number9
DOIs
Publication statusPublished - Sep 2003

Keywords

  • Absorption
  • Double-cladding fiber
  • Fiber laser
  • Mode coupling

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