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首页> 外文期刊>Optics Letters >Pre-compensation of thermally induced refractive index changes in a depressed core fully aperiodic large-pitch fiber for high average power operation
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Pre-compensation of thermally induced refractive index changes in a depressed core fully aperiodic large-pitch fiber for high average power operation

机译：热诱导的折射率预补偿在凹陷的核心完全非周期性大型音高光纤中变化，用于高平均电力操作

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摘要

To prevent the thermally induced spatial beam degradation occurring in high-power fiber lasers and amplifiers, index-depressed core "fully aperiodic large-pitch fibers" (FA-LPFs) have been designed and fabricated. In contrast to previous experimental works performed on FA-LPFs, in which the active core and the surrounding cladding material are quasi-index-matched, the core refractive index is in slight depression compared to the surrounding material (Delta n approximate to -3 x 10(-5)). Thus, the index-depressed fiber core tends first to behave as an anti-guide, preventing light from being properly guided into it. However, by increasing the absorbed pump power, the thermal load induces a parabolic refractive index change sufficient to compensate for the -3 x 10(-5) index depression in the core, enabling a robust single-mode amplification at high average power. As a proof of concept, using a 110 mu m depressed core FA-LPF, M-2 values of 1.3 were demonstrated in amplifier configuration from 60 W to a maximal value of 170 W of emitted average power only limited by the available pump power. (C) 2021 Optical Society of America
机译：为了防止高功率光纤激光器和放大器中的热致空间光束退化，设计并制作了折射率降低型芯“全非周期大间距光纤”（FA LPF）。与之前在FA LPF上进行的实验工作（其中有源纤芯和周围的包层材料是准折射率匹配的）相比，纤芯的折射率与周围的材料相比略有降低（δn近似于-3 x 10（-5））。因此，折射率降低的纤芯首先倾向于起到反导作用，防止光线被正确引导进入纤芯。然而，通过增加吸收的泵浦光功率，热负载会引起抛物线折射率变化，足以补偿核心中的-3 x 10（-5）折射率降低，从而在高平均功率下实现稳健的单模放大。作为概念证明，使用110μm压芯FA-LPF，在放大器配置中，m-2值为1.3，发射平均功率的最大值为170 W，仅受可用泵浦功率的限制。（2021）美国光学学会

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