飞秒激光烧蚀固体靶的冲击压强

Shock pressure in femtosecond laser ablation of solid target

在明确飞秒激光与物质相互作用过程中冲击压强和冲击温度概念的基础上,讨论了飞秒激光烧蚀铝、铜、硅三种固体靶过程中的冲击压强与其他物理量的关系,利用飞秒激光烧蚀固体靶的时间分辨泵浦探测阴影图提取了冲击压强的绝对值.此项研究结果对飞秒激光安全加工含能材料以及飞秒激光推进技术有重要意义.

The concepts of shock pressure and shock temperature in the interaction of femtosecond laser pulse and solid target are defined. Then the relationship between the shock pressure and other physical parameters in the process of femtosecond laser ablation of alu- minum, copper, and silicon targets are discussed. Absolute values of shock pressure are calculated by means of the time-resolved pump detection shadow-graph. Result of this investigation plays an important role in the secure femtosecond laser processing of energetic materials and the femtosecond laser propulsion technology.