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采用脉冲数字显微全息技术,对50fs单脉冲激光烧蚀铝靶过程中的物质喷射以及等离子体演化的动态过程进行了实验研究,获得了高时空分辨的动态数字全息图.由全息图观察到了热弹力波引起的二次喷射现象,并且报道了大延迟下喷射物质对400nm探测光所引起的干涉条纹的反常移动现象.通过对全息图进行数字再现,得到了不同延迟下探测光穿过等离子体后的二维相位分布,并运用逆Abel变换算法获得了等离子体折射率以及等效电子密度的时空演化动态过程.根据实验以及计算所得到的有关于喷射物的光学性质,对喷射物的结构和成分进行了分析.
The pulsed digital microscopic holographic technique was used to study the material ejection and the dynamic process of plasma evolution during the 50fs single-pulse laser ablation of aluminum target, and the dynamic digital hologram with high spatiotemporal resolution was obtained.It was observed by the hologram Thermal spring wave caused by secondary injection phenomenon, and reported a large delay under the shot material 400nm probe light caused by the interference fringe movement of the phenomenon by the hologram digitally reproduced, obtained under different delays probe light through the plasma Dimensional phase distribution and the inverse Abel transform algorithm was used to obtain the temporal and spatial dynamics of the plasma refractive index and the equivalent electron density.According to the experimental and calculated results about the optical properties of the jet, Structure and composition were analyzed.