【摘要】 应用高速纹影系统记录激光束辐照在Ly12铝靶时所产生的汽化羽扩张、空气爆炸波、熔融物质喷溅以及穿靶等现象.并由扫描摄影记录的轨迹图测出汽化羽的扩张速度为150～190m/s,空气冲击波速度为450～500m/s,靶表面高压蒸汽速度为5～7.8km/s。更多还原

【Abstract】 In this paper the transient process during a normal pulsed Nd-glass laser beam irradiating Lyl2 aluminum targets 2mm think was observed by means of high speed schlieren framing technique. It is shown that the flow field configuration consists of expanding vapor plume, air blast wave , ejection of melted target substance and target ablation and penetration. Expanding velocity of the vapor plume of 150-190m/s, velocity of the air blast wave of 450-500m/s and velocity of the high pressure steam near the target surface of 5- 7.8km/s , are obtained, respectively, by scanning the photographs.更多还原