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Fiber amplifiers under thermal loads leading to transverse mode instability

机译:热负载下的光纤放大器导致横向模式不稳定

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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.
机译:在高于平均功率阈值的情况下工作的稀土掺杂光纤放大器中的横向模式不稳定性(TMI)是由于量子缺陷加热引起的联模激发热瑞利散射引起的。我们研究了由热引起的纵向波导扰动,它通过非线性增益引起功率从基本模式(FM)转移到高阶模式(HOM),非线性增益取决于FM-HOM频移和沿光纤的位置。我们考虑了沿光纤的温度和模式分布的演变,以设计具有更高TMI阈值和更高平均功率工作稳定性的光纤设计。

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