激光与材料相互作用研究中的气体物理学

强激光辐照材料时,烧蚀蒸气吸收部分或全部激光辐射,成为部分离化等离子体.它的传播称为激光支持的吸收波(LSAW).LSAW屏蔽入射激光,同时发射易被材料表面吸收的短波长辐射.研究这些过程,可用辐射流体力学描述蒸气的运动。为了求解辐射流体力学方程,必须利用气体物理力学方法,算出蒸气的状态方程和不透明度.本文对涉及的一些气体物理力学问题,进行了概略介绍.

PHYSICAL MECHANICS OF GASES IN THE STUDY OF LASER BEAM INTERACTIONS WITH MATERIALS

When a material is irradiated by intense laser beam, the ablatior vapor absorbs part or all of laser radiation, and becomes partialy ionized plasma. The propagating plasma is referred to as a laser-supported absorption wave (LSAW). LSAW screens the incident laser beam. At the same time, it emits short-wavelength radiation which is efficiently absorbed by the material surface. From the study of this process, the vapor motion may be 'described by using radiation hydrodynamics. To solve the equation of radiati...