Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Analytical time-dependent theory of thermally induced modal instabilities in high power fiber amplifiers
AU - Hu, I-Ning
AU - Zhu, Cheng
AU - Thomas, Alexander George Roy
AU - Galvanauskas, Almantas
PY - 2013/2/2
Y1 - 2013/2/2
N2 - 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.
AB - 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.
U2 - 10.1117/12.2002732
DO - 10.1117/12.2002732
M3 - Journal article
VL - 8601
JO - Proceedings of SPIE
JF - Proceedings of SPIE
SN - 0277-786X
M1 - 1671611
ER -