【摘要】 针对高功率光纤飞秒激光放大器,介绍了啁啾脉冲放大(CPA)技术的基本原理,讨论了该结构中关键的展宽器和压缩器的发展现状与瓶颈;介绍了典型的大模场面积光纤的结构和工作原理,简介了基于大模场面积光纤的CPA系统的发展现状;介绍了非线性放大技术,讨论了实现更窄脉冲宽度、更高脉冲质量的光纤飞秒激光放大方案;最后分析了全光纤结构、相干合束、单晶光纤增益介质以及皮秒种子源等新型技术,并总结了高功率光纤飞秒激光放大器的发展趋势。更多还原

【Abstract】 This article introduces the basic principle of chirped pulse amplification(CPA) for high-power femtosecond fiber laser amplifiers, along with a discussion of the development status and bottlenecks of the key stretchers and compressors in the CPA structure. It provides a description of the structure and working principle of a typical large-mode-area fiber, and briefly discusses the development status of the corresponding CPA system based on this kind of fiber. Further, it introduces the nonlinear amplification technologies, and discusses an amplification scheme for narrower pulse duration and higher pulse quality. Finally, it presents an analysis of advanced technologies such as an all-fiber structure, coherent beam combination, single-crystal fibers as active elements, and picosecond seed sources, and provides a summary of the development trend of high-power femtosecond fiber laser amplifiers.更多还原