中文摘要：

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。

英文摘要：

The dynamic processes of Nd： YAG pulse laser ablation fused silica on the rear surface and inside are investigated by ultrafast time-resolved optical diagnosis. The evolution processes of time-resolved optical images of plasmas expansion and shock wave propagations are obtained. The results show that the multi-shock waves are emerged when the focused laser irradiates the rear surface of sample. Moreover, the reflection waves will be yielded when the generated shock wave arrives at the front surface of sample. Plasma channel is gained and the intense micro-explored damage sites will come into being when the laser focuses inside the sample. Meanwhile, it is found that the intensity of reflection and reflection shear waves at interface are determined by the incident angle of shock wave. The propagation velocities are different for different shock waves.