用多模大功率ＬＤ抽运掺Ｙｂ双包层光纤 ,研制出了一台高斜率效率的双包层光纤激光器。实验采用线形腔结构 ,ＬＤ端面抽运 2 0ｍ长掺Ｙｂ双包层光纤。ＬＤ抽运源输出中心波长 976ｎｍ ,带有直径80 0 μｍ的输出尾纤 ,数值孔径小于 0 2 2。抽运光经透镜组耦合进入光纤内包层。 Dumped Yb double clad fiber with multimode high power LD, a double-clad fiber laser with high slope efficiency was developed. Experimental linear cavity structure, LD end pumping 20m Yb doped double-clad fiber. LD pumping source output center wavelength of 976nm, with a diameter of 80μm output pigtail, numerical aperture is less than 0 2 2. Pumping light is coupled through the lens group into the fiber cladding.