22 March 2013 Analytical time-dependent theory of thermally induced modal instabilities in high power fiber amplifiers
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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.
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I-Ning Hu, I-Ning Hu, Cheng Zhu, Cheng Zhu, Chao Zhang, Chao Zhang, Alexander Thomas, Alexander Thomas, Almantas Galvanauskas, Almantas Galvanauskas, } "Analytical time-dependent theory of thermally induced modal instabilities in high power fiber amplifiers", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 860109 (22 March 2013); doi: 10.1117/12.2002732; https://doi.org/10.1117/12.2002732
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