The Influence of Pulse Width and Energy on Temperature Field in Metal Irradiated by Ultrashort-Pulsed Laser

Based on the two-temperature coupling theory, a numerical model is established by using finite element method (FEM). Taking account of the spatial and temporal shape of the laser pulse and the temperature dependence of material properties, the heating process of femtosecond laser-metal interaction is presented. The temperature field of electron and lattice in metal is obtained. The influences of laser pulse width and energy on the electron and lattice temperature field and temperature gradient field are investigated. The numerical results indicate that the vertical lattice temperature gradient is about two orders larger than the horizontal lattice temperature gradient. Under the same irradiation pulse energy, the peak electron and peak lattice temperature at the center of laser irradiation decreases with the increase of laser pulse width.