Time-resolved observation for dynamic evolution of plasma produced by multiple laser pulse exposure to metallic surface

Abstract

Pulsed laser ablation of solid target has very wide applications in many areas at present. However, most theoretical and experimental investigations focus on the interaction between pulsed laser and solid target with flat surface. It is significant for practical application of pulsed laser to research it interact with a non-smooth target surface. In this paper, time-resolved observation using ICCD camera has been performed to research process of plasma induced by nanosecond laser pulse ablation of copper target with a rough plaque. The experiment result shows the copper target is ionized at first and plasma plume then produce. Moreover, the plasma plume produce again at the end of the laser pulse because large amount of particles moves towards the target and transfer energy to the surface resulted in ionization.