针对高功率光纤激光器在实际应用过程中所面临的高效耦合及激光输出质量问题,自行设计了大模场微结构光纤的波导结构,采用集束拉丝技术制备了纤芯直径41μm、内包层数值孔径0.62、纤芯数值孔径0.05、有效模场面积约530μm2的掺镱微结构光纤。在抽运功率为35.0 W的条件下,获得的单模激光输出功率为19.1 W,斜率效率为55.2%,光束质量因子M2小于1.01。 Aiming at the high efficiency coupling and laser output quality problems of high power fiber laser in practical application, a waveguide structure of large mode field microstructure fiber was designed. The core diameter of 41μm and the inner cladding numerical aperture of 0.62 , Core numerical aperture of 0.05, effective mode field area of ​​about 530μm2 doped ytterbium-doped microstructured fiber. Under the pumping power of 35.0 W, the single-mode laser output power was 19.1 W, the slope efficiency was 55.2% and the beam quality factor M2 was less than 1.01.