We studied the dynamics of nanosecond-pulsed laser ablation of graphite-coated and black-paint-coated targets in liquids using a custom-designed time-resolved photoelasticity imaging technique. We presented the first demonstration of a planar head wave that was almost parallel to the target surface. In the solid, we observed a planar stress wave that was a counterpart of the planar head wave. This planar stress wave distorted the typical stress distribution induced by pulsed laser ablation in liquid. The planar head wave and stress wave traveled at the acoustic speed in the corresponding medium. These wavefronts were stronger as the number of shots increased.

中文翻译：

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脉冲激光烧蚀在液体中引起的平面头波

我们使用定制设计的时间分辨光弹性成像技术研究了液体中石墨涂层和黑色涂层靶的纳秒脉冲激光烧蚀动力学。我们首次展示了几乎平行于目标表面的平面顶波。在固体中，我们观察到一个平面应力波，它是平面顶波的对应物。这种平面应力波扭曲了液体中脉冲激光烧蚀引起的典型应力分布。平面头波和应力波在相应的介质中以声速传播。随着射击次数的增加，这些波前变得更强。