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20 June 2024 Standard STRS versus TMI effects in high power fibre amplifiers
Michalis N. Zervas
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Proceedings Volume PC13003, Fiber Lasers and Glass Photonics: Materials through Applications IV; PC1300309 (2024) https://doi.org/10.1117/12.3024581
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
We first carry out a stability analysis on the standard two-wave STRS process in frequency-detuned two-mode fiber amplifiers, in the presence of pump/signal quantum defect thermal load. We show that the standard two-wave STRS process is stable against small modal perturbations, and as such it does not describe adequately the widely observed thermally-induced TMI process. We further show that inclusion of FWM effects and three-wave interaction, through the addition of an anti-Stokes LP11 wave, is required to describe modal instabilities above a power threshold, and a previously derived TMI power threshold formula is recovered. This work sheds new light on the standard STRS process and adds new insight into its connection with TMI effects in high power fiber amplifiers.
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Michalis N. Zervas "Standard STRS versus TMI effects in high power fibre amplifiers", Proc. SPIE PC13003, Fiber Lasers and Glass Photonics: Materials through Applications IV, PC1300309 (20 June 2024); https://doi.org/10.1117/12.3024581
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KEYWORDS
High power fiber amplifiers
Thermal modeling
Fiber amplifiers
Phase shifts
Rayleigh scattering
Thermal stability
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