7 March 2014 Fiber amplifiers under thermal loads leading to transverse mode instability
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Transverse mode instability (TMI) in rare-earth doped fiber amplifiers operating above an average power threshold is caused by intermodal stimulated thermal Rayleigh scattering due to quantum defect heating. We investigate thermally induced longitudinal waveguide perturbations causing power transfer from the fundamental mode (FM) to the higher order mode (HOM) by a nonlinear gain, which depends on the FM-HOM frequency shift and position along the fiber. We take temperature and mode profile evolution along the fiber into consideration to engineer fiber designs with increased TMI threshold and operation stability at higher average powers.
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Mette M Johansen, Mette M Johansen, Kristian R. Hansen, Kristian R. Hansen, Thomas T. Alkeskjold, Thomas T. Alkeskjold, Jesper Lægsgaard, Jesper Lægsgaard, "Fiber amplifiers under thermal loads leading to transverse mode instability", Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 89612P (7 March 2014); doi: 10.1117/12.2037687; https://doi.org/10.1117/12.2037687

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