高能量光纤激光器在工业、军事、天文、基础科学研究等领域有重要的应用，发展新型高能量激光脉冲技术是当前我国科技创新领域的重大需求。然而光纤激光器直接产生的单脉冲能量难以进一步提高到微焦量级，这正是目前面临的重大挑战和亟待解决的难题。本项目紧贴国家重大需求，以光场调控为切入点，在时空锁模光纤激光器研究的基础上首次提出基于多模式同步强脉动调控的新型光纤激光原理、发展相关关键技术实现微焦量级时空锁模脉冲激光的直接产生，并用于材料加工研究。具体内容如下：（1）多模式同步强脉动的机理研究，并获得关键实验参数；（2）设计和制备石墨烯包覆多模微纳光纤调控器件；（3）构建时空锁模光纤激光器，实验研究多模式同步强脉动的产生及其动力学特性，获得微焦量级皮秒脉冲；（4）将该激光器应用于脆性材料焊接。本项目的研究对发展高能量脉冲光场调控技术，促进其在前沿激光领域的应用具有重要的科学意义。

High energy fiber laser has important applications in fields of industry, military, astronomy, basic scientific research and so on. The development of new high energy laser pulse technology is a major demand in the field of science and technology innovation. However, the single pulse energy directly generated by the laser cannot be further improved to the micro joule level, which is the major challenge and the problem to be solved. Based on the research of spatio-temporal mode-locked fiber laser, a new type of high energy laser principle based on multi-mode synchronously and strongly pulsating control is proposed for the first time in this project, which is closely related to the major national needs. The key technologies are developed to realize the direct generation of micro joule level spatio-temporal mode-locked pulse and used in material processing research. The specific contents are as follows: (1) Research on the mechanism of synchronous and strong pulsating of multi-mode, and obtain the key experimental parameters; (2) Design and prepare the key devices of graphene coated multi-mode micro fiber; (3) Construct the spatio-temporal mode-locked fiber laser, experimentally research the generation and dynamic characteristics of multi-mode synchronous and strong pulsating, and obtain the picosecond pulse with energy up to micro joule ; (4) Apply the laser in brittle material welding. The research of this project has important scientific significance for developing high energy pulsed light manipulating technology and promoting its application in laser field.