提出了一种新结构全光纤激光器。采用振荡-放大一体化结构，有效抑制了反射激光对光纤激光器稳定性的影响，实现了高效率、高功率和高光束质量的输出。实验搭建了光纤激光器系统，实现了大于2 kW的输出，抽运光和输出光之间的转换效率为81.6%，光束质量M2因子优于1.4。采用高反射金属材料验证了该激光器的抗反射性能，激光器在满功率输出下，能够长时间稳定工作。

A novel antireflection all-fiber laser is presented. The oscillator-amplifier integration is utilized to suppress the effect of the reflection light on the stability of the fiber laser, and obtain efficient output with high power and beam quality. The fiber laser system is set up. The output power more than 2 kW with an optical-optical efficiency of 81.6% is obtained, and the beam quality M2 is better than 1.4.The high-reflected metal is used to verify antireflection ability of the laser. The experimental results show that the system has good long-term stability under full power output.