采用堆叠法制作了纤芯直径为20μm的Nd3+离子掺杂磷酸盐玻璃D形双包层光纤,采用793nm半导体激光作为抽运源,测定并分析其光纤激光性能和斜率效率,光纤的最大输出功率为2.52W,斜率效率为41.5%。采用同样的办法进一步制作了六角形、偏心形和圆形内包层结构的光纤,对比研究了内包层结构对光纤输出性能的影响。结果显示相比于其他内包层结构的光纤,D形内包层结构光纤对抽运光的吸收效率更高,有助于光纤激光性能的提高。 The D-type double-clad fiber doped Nd3 + ion-doped phosphate glass with a core diameter of 20μm was fabricated by the stacking method. The 793nm semiconductor laser was used as the pumping source to measure and analyze the fiber laser performance and slope efficiency. The maximum output power Is 2.52W, the slope efficiency is 41.5%. In the same way, hexagonal, eccentric and circular inner cladding optical fibers were further fabricated and the effects of the inner cladding structure on the optical output performance were compared. The results show that the D-type inner cladding fiber has a higher absorption efficiency than the other inner-cladding fibers, which contributes to the improvement of fiber laser performance.