Analysis of melt ejection during long pulsed laser drilling

Zhang Ting-Zhong¹, Jia Zhi-Chao¹, Cui Hai-Chao², Zhu De-Hua³, Ni Xiao-Wu¹, Lu Jian^{1, †,}

Cross-sections of keyhole for simulation and experiment results on 304 SS and aluminum targets in laser drilling. (a) Simulation result of laser drilling on 304 SS; (b) experimental result of laser drilling on 304 SS; (c) simulation result of laser drilling on aluminum; (d) experimental result of laser drilling on aluminum. Laser pulse power density is 5.71 MW/cm² and pulse width is 1 ms.