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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Yb3+光纤中Al3+共掺的特性.揭示出在高掺Yb3+的石英基光纤中,共掺Al3+的摩尔浓度为Yb3+摩尔浓度的9—11倍时既可以减小Yb3+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Yb3+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Yb3+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Al3+的掺Yb3+光纤制作提供了良好的借鉴作用.
Based on the experimental results, the characteristics of Al3 + co-doping in Yb3 + -doped Yb3 + -doped fiber for quartz-based cladding of high power fiber lasers are analyzed. The results show that the molar concentration of Al3 + coexisted in Yb3 + doped Yb3 + Concentration of 9-11 times can not only reduce the concentration of Yb3 + quenching probability, but also to obtain high absorption coefficient, but also to better meet the numerical aperture of the conclusion on the basis of the use of MCVD equipment combined with wet Doped Yb3 + optical fiber preform. The testing of related parameters of the fiber after drawing shows that the absorption coefficient of Yb3 + doped fiber can reach 620 dB / m at 976 nm by precisely controlling the deposition temperature of the loose layer Good repeatability.This conclusion provides a good reference for the fabrication of Yb3 + doped Yb3 + codoped Al3 +.