由相隔一定时间的纳秒级短脉冲激光和毫秒级长脉冲激光构成的组合脉冲激光，结合了短脉冲激光高峰值功率和长脉冲激光高输出能量的特点，可以有效改善长脉冲激光与透明材料相互作用时激光能量耦合效率低的缺点，进而达到作用效果增强的目的。本项目拟结合数值模拟和实验测试对组合脉冲激光与透明材料相互作用效果及机理开展研究。建立激光等离子体传播扩展模型，获得短脉冲激光支持爆轰波及长脉冲激光支持燃烧波温度场、速度场及透射激光场分布，分析两者的持续时间和转化关系；利用高速摄影法、声学信号探测法、光谱诊断法对作用过程进行实时探测，研究激光支持燃烧波特性；进而确定不同组合脉冲激光参数（延时、能量密度、光斑大小）和切向气流与作用效果的关系，结合数值模拟分析燃烧波对激光能量耦合效率的影响，获取组合脉冲激光作用机理。通过本项目的研究，进一步明确组合脉冲激光作用效果增强机理，为其在激光加工、激光损伤等领域的应用提供参考。

A kind of combined pulse laser(CPL) composed of a millisecond(ms) laser and a nanosecond(ns) laser is used to interact with transparent materials. The CPL combines the high peak power of the ns laser with the high energy of the ms laser, which is a promising method to improve the energy coupling efficiency when interacting with the transparent materials. In this project, the mechanism of the enhancement effect during the CPL-transparent materials interaction is studied experimentally and numerically. A gas-dynamic model is built to obtain the information of the temperature, the velocity, and the transmitted laser field. Then, the process of the ms laser-supported detonation wave converting to the ns laser-supported combustion wave is analyzed. After that, the high-speed photography, the acoustic signal acquisition method and the spectral diagnostics are applied simultaneously to obtain the characteristic of the combustion wave. Moreover, the influence of the laser parameters (delay, laser fluence and spot size) and the tangential air flow on the damage behavior is studied to analyze the effect of the combustion wave on the laser energy coupling efficiency, and investigate the CPL-transparent materials interaction mechanism. The outcome of this project will promote the understanding of the enhancement effect mechanism of the CPL, and provide some references for applying the CPL to laser machining and laser damage fields.