Analytical time-dependent theory of thermally induced modal instabilities in high power fiber amplifiers

Hu, I-Ning and Zhu, Cheng and Thomas, Alexander George Roy and Galvanauskas, Almantas (2013) Analytical time-dependent theory of thermally induced modal instabilities in high power fiber amplifiers. Proceedings of SPIE, 8601. ISSN 0277-786X

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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.

Item Type: Journal Article
Journal or Publication Title: Proceedings of SPIE
Departments: Faculty of Science and Technology > Physics
ID Code: 85840
Deposited By: ep_importer_pure
Deposited On: 05 Apr 2017 12:18
Refereed?: Yes
Published?: Published
Last Modified: 25 Feb 2020 07:52
URI: https://eprints.lancs.ac.uk/id/eprint/85840

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