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首页> 外文期刊>Optics Letters >All-fiber laser pump reflector based on a femtosecond-written inner cladding Bragg grating
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All-fiber laser pump reflector based on a femtosecond-written inner cladding Bragg grating

机译：全纤维激光泵反射器基于飞秒写入内包层布拉格光栅

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摘要

We report on the writing of chirped cladding Bragg gratings using 400 nm femtosecond pulses and the phase-mask inscription technique in the pure silica inner cladding of the gain fiber. The usefulness of such a fiber component is demonstrated as a pump reflector in a cladding-pumped all-fiber laser. A reflectivity of 53% for the residual pump power guided in the highly multimode 125 mu m fiber's cladding is achieved, allowing for significant pump recycling in the fiber laser cavity which therefore optimizes the overall laser performances. As proof of concept, adding this pump reflector at the output of a 25 W erbium-doped fiber laser operating near 1.6 mu m increased its slope efficiency according to the launched pump power from 17% to 23%, with the beneficial effect of reducing by 25% the optimal gain fiber length. This new, to the best of our knowledge, fiber laser component would have a great impact on the efficiency and cost of high-power cladding-pumped fiber laser systems. (C) 2019 Optical Society of America
机译：我们在增益纤维的纯二氧化硅内包层中使用400 nm femtosecond脉冲和相掩模题字技术报告了啁啾包层布拉格光栅的写入。这种纤维部件的有用性被证明为包层泵浦的全光纤激光器中的泵反射器。实现在高度多模125μm光纤包层中引导的剩余泵功率的53％的反射率，允许在光纤激光腔中回收的显着泵，从而优化整体激光表演。作为概念验证，在接近1.6亩25瓦掺铒光纤激光器工作的输出添加此泵浦反射器M根据启动泵浦功率增加了它的斜率效率从17％到23％，其中通过减少的有益效果25％最佳增益纤维长度。这一新的是，尽我们所知，光纤激光器分量对高功率包层泵浦光纤激光系统的效率和成本产生了很大的影响。 （c）2019年光学学会

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