Tapered fiber bundles for combining high-power diode lasers.
Tapered fiber bundles for combining high-power diode lasers.
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DOI：
10.1364/ao.43.003893
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发表时间：
2004-07
期刊：
影响因子：
1.9
通讯作者：
A. Kosterin;V. Temyanko;M. Fallahi;M. Mansuripur
中科院分区：
文献类型：
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作者：
A. Kosterin;V. Temyanko;M. Fallahi;M. Mansuripur
锥形光纤束常用于将多个半导体激光器的输出功率组合成多模光纤，用于泵浦光纤激光器和放大器。一般认为，这种组合器的亮度不超过单个输入光纤的亮度。我们报告了锥形光纤（和光纤束）的亮度取决于发射到单个光纤的光束的锥度比和模式填充特性。因此，可以通过选择填充一小部分输入光纤模态容量的光源来增加亮度。作为概念的证明，我们提出了测量的结果，锥形光纤束合并具有低输出的模数。在每个输入多模光纤的低模式填充条件下（即填充模式的比例<或=0.29），我们报告了19 x 1束的亮度增强8.0 dB， 7 x 1束的亮度增强6.7 dB， 3 x 1束的亮度增强4.0 dB。我们测量的耦合效率在给定束中不同光纤之间的变化约为1%-2%，证实了所制造器件的均匀性和质量。
Tapered fiber bundles are often used to combine the output power of several semiconductor lasers into a multimode optical fiber for the purpose of pumping fiber lasers and amplifiers. It is generally recognized that the brightness of such combiners does not exceed the brightness of the individual input fibers. We report that the brightness of the tapered fibers (and fiber bundles) depends on both the taper ratio and the mode-filling properties of the beams launched into the individual fibers. Brightness, therefore, can be increased by selection of sources that fill a small fraction of the input fiber's modal capacity. As proof of concept, we present the results of measurements on tapered fiber-bundle combiners having a low-output étendue. Under low mode-filling conditions per input multimode fiber (i.e., fraction of filled modes < or =0.29), we report brightness enhancements of 8.0 dB for 19 x 1 bundles, 6.7 dB for 7 x 1 bundles, and 4.0 dB for 3 x 1 combiners. Our measured coupling efficiency variations of approximately 1%-2% among the various fibers in a given bundle confirm the uniformity and quality of the fabricated devices.