设计了一种基于915 nm半导体激光单端抽运的单纤准单模全光纤激光振荡器，其工作波长为1080 nm，输出功率可达2.02 kW。结合理论和实验，研究了增益光纤长度、受激拉曼散射(SRS)和输出功率之间的关系。通过对增益光纤长度进行优化，在保证大于2 kW激光功率的前提下，实现了高SRS抑制比的激光输出，输出激光中SRS功率占比约为0.8%。180 min内激光器的功率不稳定度小于±1%，光-光转换效率约为70%。通过合理设计光纤盘绕，有效抑制了光纤中光的高阶模式，在满功率输出时成功地获得了准单模激光(光束质量因子M2≈1.5)，并对该激光器在激光切割中的应用进行了研究。

We design a single fiber quasi-single mode all-fiber laser oscillator based on single-end 915 nm semiconductor laser forward-pumping, which produces 2.02 kW output power at 1080 nm. We study the relationship among the gain fiber length, stimulated Raman scattering (SRS), and the output power theoretically and experimentally. We optimize the length of the gain fiber to achieve a laser with a high SRS suppression ratio of 0.8 %, which has an output power of more than 2 kW. The optical to optical conversion efficiency of the laser oscillator is about 70%, and the power fluctuation is less than ±1% within 180 min running. The fiber coiling technique is adopted to effectively depress the high-order laser modes to obtain a quasi-single-mode laser (beam quality factor M2≈1.5) at the maximum output power. What is more, the application of the laser in laser cutting is investigated.