بررسي عددي اثر پهناي زماني پالس ليزر نانو ثانيه در كند و سوز و تبخير ليزري

In recent years many numerical models have been proposed for nanosecond laser pulse ablation of metals. In this paper the effect of laser pulse duration on temperature, density, and velocity distribution of Copper vapor produced by laser ablation is numerically simulated by finite difference numerical methods. Simulation results show that for fixed laser pulse energy, reducing pulse duration results in increased target surface temperature and, so, increased vapor velocity, density, and evaporation depth. This finding shows that the growth rate of thin film in laser ablation can be enhanced by reducing laser pulse duration .