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采用超快时间分辨的光学诊断技术,研究了Nd:YAG脉冲激光分别烧蚀熔石英样品后表面和体内的动态过程,获得了冲击波和等离子体演化过程的时间分辨图像。结果表明,在样品后表面,激光与材料作用产生了多个在体内传输的冲击波,冲击波传播到样品前表面时会发生反射;在样品体内,激光与材料作用产生了等离子通道,在激光焦点处和自聚焦处产生了较强的微爆点。实验还发现,冲击波在界面的反射波和反射剪切波强度与冲击波入射角有关,不同冲击波的传播速度不同。
Using the ultra-fast time-resolved optical diagnosis technology, the dynamic process of ablation of fused silica samples by Nd: YAG pulsed laser was studied respectively. The time-resolved images of the shock wave and plasma evolution were obtained. The results show that the laser and the material produce a number of shock waves that are transmitted in the body at the back surface of the sample. The shock wave is reflected when it propagates to the front surface of the sample. In the sample body, the laser interacts with the material to generate the plasma channel. And self-focus produced a strong micro-explosion point. The experiment also found that the shock waves in the interface reflected wave and reflected shear wave intensity and shock wave incidence angle related to the different shock wave propagation velocity.