高功率光纤激光器在工业加工、材料处理等领域有着诸多应用,得到国内外研究机构的广泛关注。目前,高功率光纤激光器主要有两种结构,一种是直接振荡器结构,一种是主振荡功率放大结构。采用振荡器结构的光纤激光器具有结构简单、稳定性好、成本低廉等优点,是目前中低功率激光器市场使用较多的一类方案。2013年,国防科学技术大学基于单端抽运结构实现了输出功率1kW的全光纤振荡器 High-power fiber lasers have many applications in the fields of industrial processing and material processing, and have drawn wide attention from domestic and foreign research institutions. At present, there are mainly two kinds of high-power fiber laser structure, one is the direct oscillator structure, one is the main oscillator power amplifier structure. The optical fiber laser with an oscillator structure has the advantages of simple structure, good stability, low cost and the like, and is currently used in the low-power laser market. In 2013, the National University of Defense Technology based on single-ended pumping structure to achieve the output power of 1kW all-optical oscillator