Ablation of metal target materials by long-pulse high energy laser

The ablation experiments on different target materials such as Al, Fe, Cu and Ti were conducted by using 2 kinds of lasers to investigate the interaction of the long-pulse high-energy laser with metal target plates. The ablation ratios of various materials under different energy densities were obtained by recording the times of laser bombardment the laser took to penetrate the target material as well as measuring the laser energy going through the hole and the area of the hole. The experiments prove that the ablation ratio of the laser beam with low energy density is much lower than that of the laser beam with high energy density, even sometimes the former can still makes a limited ablation on the plate. A long-pulse laser, whose energy density can cause the liquid mass transferred, can get a greater ablation ratio and a hole with larger cross section.