为研究纳秒激光烧蚀铝产生的等离子体羽流膨胀速度特性,采用波长1 064 nm,脉宽10 ns,功率密度～1.3×108W/cm2YAG激光器烧蚀铝靶材,得到100 ns内铝等离子体在～260 Pa背景压力下的膨胀照片。通过对拍摄照片数据处理得到,等离子体羽流膨胀速度相对于靶面法线方向大致呈轴对称分布,且高斯函数可以很好地描述烧蚀等离子体羽流速度分布。 In order to study the plasma plume expansion rate induced by nanosecond laser ablation of aluminum, the aluminum target was ablated by a laser with a wavelength of 1 064 nm, a pulse width of 10 ns and a power density of 1.3 × 108 W / cm 2 YAG to obtain a plasma of aluminum within 100 ns Body Expansion at ~ 260 Pa Background Pressure. By processing the photograph data, the plume expansion velocity of the plasma is roughly axisymmetrically distributed with respect to the normal direction of the target surface, and the Gaussian function can well describe the plume velocity distribution of the ablation plasma.