Influence of physical parameters on ultrashort pulse laser excitation temperature field

Based on the two-temperature theory, a numerical model to solve the heating process in surface vicinity irradiated by ultrashort pulse laser is established to investigate the influence of temperature-dependent properties of material on temperature field in metal(Au) irradiated by ultrashort pulse laser. Taking account of the temperature-dependent properties of material which includes the electron-phonon coupling factor, electron thermal conductivity, electron heat capacity, lattice heat capacity, as well as the spatial and temporal shapes of the laser pulse, the transient temperature field irradiated by ultrashort pulse laser in metal(Au) is numerical simulated by the finite element method (FEM). The electron and lattice transient temperature distributions in the vicinity of laser-irradiated region are obtained. Moreover, the temperature fields obtained from considering and neglecting the temperature-dependent properties of material are compared. The numerical results indicate that the temperature-dependent properties of material make the electron and lattice temperatures rise faster, the temperature maximum and the irradiated become higher. This study establishes a theory basis for stress field and ultrasound field in metal generated by femto-second laser.