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Efficient pump module coupling >1kW from a compact detachable fiber

机译:紧凑的可分离光纤可有效连接大于1kW的泵模块

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In the most developed fiber amplifiers, optical pump power is introduced into the ~400μm-diameter, 0.46NA first cladding of the double-clad, Yb-doped, gain fiber, using a (6+l):1 multi-mode fiber combiner. For this configuration, the core diameter and numerical aperture of the pump delivery fibers have maximum values of ~225μm and ~0.22, respectively. This paper presents the first fiber-coupled laser-diode pump module emitting more than 1kW of cladding-mode-stripped power from a detachable 225μm, 0.22NA delivery fiber at 976nm. The electrical-to-optical power conversion efficiency at lkW is ~50%. The FWHM spectral width at lkW output is ~4nm and has an excellent overlap with the narrow absorption spectrum of ytterbium in glass. Six of these pump modules attached to a (6+1):1 multimode combiner enable a 5-6kW, single-mode, Yb-doped fiber amplifier.
机译:在最先进的光纤放大器中,使用(6 + 1):1多模光纤合路器将光泵浦功率引入直径为〜400μm,0.46NA的双包层,掺Yb增益光纤的第一包层。 。对于此配置,泵送光纤的纤芯直径和数值孔径的最大值分别为〜225μm和〜0.22。本文介绍了第一个光纤耦合激光二极管泵浦模块,该模块从可分离的225μm,0.22NA的传送光纤在976nm处发出超过1kW的包层模式剥离功率。 1kW时的电光功率转换效率约为50%。 1kW输出的FWHM光谱宽度约为4nm,与with在玻璃中的窄吸收光谱有很好的重叠。这些泵模块中的六个泵模块与(6 + 1):1多模组合器相连,可实现5-6kW,单模,掺Yb的光纤放大器。

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