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Proceedings Paper

Analytical time-dependent theory of thermally induced modal instabilities in high power fiber amplifiers
Author(s): I-Ning Hu; Cheng Zhu; Chao Zhang; Alexander Thomas; Almantas Galvanauskas
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Paper Abstract

A time-dependent analytical model is rigorously derived which shows that the thermally induced modal instability in high power rare-earth doped fiber amplifiers is fundamentally a two-wave mixing between fundamental and higher-order modes through a thermally-induced grating imprinted by beating between these modes. We show that previously postulated movement of this grating to phase-match the coupling between the modes naturally occurs due to a finite thermal-response time of a fiber. This theory is consistent with experimental observations in that it accurately predicts the onset-like threshold and temporal instabilities in the kilohertz-frequency range.

Paper Details

Date Published: 22 March 2013
PDF: 9 pages
Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 860109 (22 March 2013); doi: 10.1117/12.2002732
Show Author Affiliations
I-Ning Hu, The Univ. of Michigan (United States)
Cheng Zhu, The Univ. of Michigan (United States)
Chao Zhang, The Univ. of Michigan (United States)
Alexander Thomas, The Univ. of Michigan (United States)
Almantas Galvanauskas, The Univ. of Michigan (United States)

Published in SPIE Proceedings Vol. 8601:
Fiber Lasers X: Technology, Systems, and Applications
Sami T. Hendow, Editor(s)

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