侧面抽运的掺Yb双包层光纤激光器

利用光纤角度磨抛侧面耦合新技术研究了侧面抽运的掺Yb双包层光纤激光器。实验上采取新的加工工艺获得了端面具有小锐角磨抛斜角的多模光纤，专门设计的高精密机械调整结构有效地将多模光纤的斜面和双包层光纤的侧面精确对准，通过不同的折射率匹配材料进行的研究，发现折射率匹配材料对于注入功率和抽运效率都有较大影响。实验中通过光纤角度侧面耦合器能够注入1．12W抽运光进入双包层光纤，侧面耦合效率最高可达80％。将该侧面耦合技术用于侧面抽运的掺Yb双包层光纤激光器，在单个尾纤输出的半导体激光器侧面抽运下得到光纤激光器的最大连续激光输出功率282mW，斜率效率为55．5％。实验结果表明，光纤角度磨抛耦合技术是掺Yb双包层光纤激光器的一种简单有效的侧面抽运方式。

Side-Pumped Yb-Doped Double-Clad Fiber Laser

Side-pumped Yb-doped double-clad fiber laser is studied with a novel technology of fiber-angle-polished side-coupler. In experiments, multimode fibers with small polished-angle end by advanced technics are acquired and the precision mechanical adjustments is used to aim the polished-angle multimode fiber end at the double-clad fiber side accurately. Several kinds of index-matching materials are adopted for research to find that the index-matching materials are critical to launching power and coupling efficiency in this kind of side-couplers. The fiber-angle-polished side-coupled technology is adopted to inject maximal pumping power of 1.12 W into double-clad fiber, and the highest coupling efficiency acquired is even near 80%. Using the side-coupled to pump a CW side-pumped Yb-doped double-clad fiber laser, maximum output power of 282 mW and slope efficiency of 55.5% are obtained by one pigtail laser diode pumping source. The experimental results demonstrate fiber-angle-polished side-coupling technology is a simple and efficient pumping way for Yb-doped double-clad fiber laser.