针对定向能激光**系统对结构紧凑的高功率、高质量光纤激光源的需求, 提出了一种新颖的基于凹面光栅的光纤激光谱组束方案。该系统可将组束激光直接聚焦到目标点, 且可以根据目标点位置的不同, 通过对各组束阵元输出端位置的实时调整, 实现对目标的灵活跟踪。分析了基于凹面光栅光纤激光谱组束系统的工作原理, 设计了用于组束的闪耀光栅结构的凹面光栅, 阐述了系统实现目标跟踪的原理。根据目标点位置的不同, 通过调整系统状态, 可使该系统适应不同目标距离的应用需求,非常适于激光定向能系统应用。

Aiming at the demand of highenergy laser system for fiber laser source with high power, high beam quality and compact structure, a novel spectral beam combination scheme for fiber lasers based on concave gratings is presented. In this scheme, the combined beam can be focused upon the target without any additional optical components, and the output beam of each array can be adjusted in real time to achieve the flexible tracking on the goal of depending on the different target positions. Basic working principles of spectral beam combining of fiber lasers based on concave grating are analyzed and a kind of conventional concave grating for spectral beam combination is designed. A preliminary study on target tracking of the system is achieved.