一种新的破坏模式：反冲塞

观察了到了长脉冲激束辐照到铜薄片上产珠 新的破坏模式。这种破坏可以分为三个阶段：鼓包；剪垣变形局部化及由冲塞所引起的贯穿，这种破坏模式的典型特征是鼓包和冲塞都是沿着入射激光相反的方向进行的，它同人们所塾知的激光引起材料破坏的分裂，烤化和汽化等不同，激发束的特殊空间分布造成了这种新的破坏模式。

A NEW KIND OF DAMAGE:REVERSE PLUGGING

A new kind of failure mode is observed in circular brass foils which their peripheries are fixed and their surfaces are subjected to a long pulsed laser over a central region. The failure is classified into three stages; they are referred to as thermal bulging, localized shear deformation and per formation by plugging. A distinct feature of the failure mode is that bulging and plugging occurred in the direction opposite to the incident laser beam. The failure mode is different from the well-known types of laser induced material damage, such as spallation, melting and/or vaporization. The distinct feature of the spatial distribution of the laser intensity induces the nwe kind of failure mode.