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设计了3套针对“神光-Ⅱ”倍频激光直接驱动的透镜阵列均匀辐照系统,并对冲击波的平面性进行了实验研究。结果表明,冲击波的平面性与透镜阵列参数、平面靶厚度、靶面位置等有关,采用列阵元数为121的透镜阵列进行激光束匀滑驱动的冲击波平面性最好,间接说明它在靶面的激光辐照是最均匀的;另外,随着靶厚的增加,冲击波平面性变差,平面区变小;而且冲击波平面性随靶面离焦位置的变化成一定的周期性变化,第2套透镜阵列焦点处的冲击波平面性最好。
Three sets of uniform irradiation system of lens array for direct driving of “Shen-Ⅱ” double-frequency laser were designed, and the planarity of shock wave was experimentally studied. The results show that the planarity of the shock wave is related to the parameters of the lens array, the thickness of the planar target and the position of the target surface. The planarity of the shock wave of the lens array with the array element 121 is the best, In addition, with the increase of the target thickness, the shock wave planarity becomes worse and the plane region becomes smaller. Moreover, the planarity of the shock wave changes periodically with the change of the target defocusing position, and the The shock wave at the focal point of 2 lens arrays has the best planarity.