脉冲激光在板状介质中的爆轰破坏

Detonative Destruction of the Pulse Laser in Tabular Medium

本文从激光作用时间内介质存在“假膨胀”的假设出发，采用圆柱模型研究了脉冲激光在板状介质内部产生的爆轰破坏机理。文中认为，当固体介质为各向同性且为板状时，可采用圆柱轴对称模型，并将激光作用点置于圆柱坐标系的原点。脉冲激光作用时，介质吸收光能导致圆柱体内压力增大，但在激光作用时间内体积不变，从而得到介质产生的压力脉冲的迁移效应。对位移波方程应用Ｌａｐｌａｃｅ变换和Ｆａｒｔｏｎｇｅｎ定理得到了位移波的解析解。

In this paper ,according to the hypothesis that there is a″pseudoexpansion″inside a medium dur-ing the laser pulse,the mechanism of detonative destruction produced inside a tabular medium by apulse laser is studied by using the cylindrical model when the solid medium is isotropy and tabular. Acylindrically axial symmetrical model is used,and the origin point of the cylindricae coordinate is lo-cated on the laser actins point.Durins the laser pulse,due to absorption of the laser energy,the pres-sure inside the cylinder increases,but the volume is unchanged , thus the migration effect of the pres-sure pulse is gotten.An analytical solution of the displacement wave equation is gotten by using theLaplace′s transform and Fartongen is theory.