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在研究激光与靶物质相互作用以及激光驱动的效应中,许多问题具有二维性质。这种二维问题,目前都是用计算机来模拟研究的。本工作在[1]的基础上通过数值模拟,考虑了平面靶中激光驱动冲击波传播和平面性的二维问题。计算表明,对于高斯激光束,冲击波阵面为一曲面,波阵面上不同径向位置的压强是不同的。光束中心压强约为光斑边缘处压强的1.7倍。冲击波速度也有个径向分布,由中心向外逐渐下降。共计算了两个典型模型,其中一个与实验结果进行了比较,两者符合较好。
Many problems have two-dimensional properties in the study of laser-target interaction and laser-driven effects. This two-dimensional problem is currently simulated by computer. Based on [1], this work considers the two-dimensional problem of laser-driven shock wave propagation and planarity in planar targets through numerical simulation. The calculation shows that for the Gaussian laser beam, the shock wave front is a curved surface, and the pressure at different radial positions on the wave front is different. The beam center pressure is about 1.7 times the pressure at the edge of the spot. Shock wave velocity also has a radial distribution, gradually decreased outward from the center. A total of two typical models were calculated, one of which was compared with the experimental results, the two were in good agreement.