与采用主振荡功率放大结构的光纤激光器相比,光纤激光振荡器具有结构紧凑、成本低廉、抗反射回光能力强、稳定性好等优点。随着光纤器件和工艺的发展,全光纤激光振荡器实现了5 kW近衍射极限输出。围绕掺镱光纤激光振荡器,详细介绍了空间结构振荡器和全光纤结构振荡器的研究进展及其面临的问题。根据高功率光纤激光振荡器的主要限制因素非线性效应和模式不稳定,从特殊设计增益光纤和振荡器全局优化设计两方面,初步探讨了进一步提升高功率光纤振荡器功率的技术途径,以期为实现万瓦量级单模光纤激光振荡器提供参考。

Compared with master oscillator power amplifiers, fiber laser oscillators have the advantages of compact structure, low cost, strong anti-reflection light return capability, and good stability. With the development of fiber optic devices and processes, all-fiber laser oscillators achieve a near-diffraction limit output of 5 kW. As for the ytterbium-doped fiber laser oscillator, the research progress and problems faced by the space-coupled fiber oscillator and the all-fiber oscillator are introduced in detail. According to the nonlinear effects and mode instabilities that are the main limiting factors of high-power fiber laser oscillators, the technical approach to further increase the power of high-power fiber laser oscillators is discussed preliminarily, from the aspects of specially designed gain optical fibers and global oscillator optimization, in order to provide reference for the realization of single-mode fiber laser oscillators with 10 kW output.