中文摘要：

基于实验测试结果分析了用于大功率光纤激光器的石英基包层抽运掺Yb^3＋光纤中Al^3＋共掺的特性.揭示出在高掺Yb^3＋的石英基光纤中,共掺Al^3＋的摩尔浓度为Yb^3＋摩尔浓度的9—11倍时既可以减小Yb^3＋的浓度猝灭概率,又可以获得高吸收系数,同时还可更好地满足数值孔径的要求的结论.在此基础上利用MCVD设备并结合湿法掺杂工艺制作出多根石英基掺Yb^3＋光纤预制棒,对拉丝后光纤的相关参数测试表明,通过精确控制疏松层的沉积温度,掺Yb^3＋光纤在976nm波长的吸收系数可高达620dB/m,且重复性好.这一结论为共掺Al^3＋的掺Yb^3＋光纤制作提供了良好的借鉴作用.

英文摘要：

The characteristics of co-doping Al 3＋ in ytterbium-doped silica-based fiber used for high-power cladding pumped laser were analyzed based on experimental analysis. The results show that the optimum mole percent of Al 3＋ to Yb 3＋ is 9—11 for high concentration of ytterbium-doped silica-based fiber at which low concentration quenching probability,high absorption coefficient and proper numerical aperture can be obtained. Meanwhile,ytterbium-doped silica-based fiber preforms were fabricated by MCVD and special solution doping technique. By soot layer temperature experiment and test of the related parameters of the drawn fiber,the results show that the optimum temperature for making soot layer can be accurately controlled and the absorption coefficient at 976 nm was as high as 620 dB/m with good repeatability. This conclusion makes a useful reference for fabrication of ytterbium-doped Al 3＋ co-doped fiber.