Shock Wave Generation in a Metal during Absorption of a Short Laser Pulse
This paper presents the first stage of a tool development for numerical simulation of fast transient processes in thin metal films under short intense pulses of laser radiation. Absorption of laser radiation by metals is evaluated by hyperbolic two-temperature model which determines the laser pulse conversion into heat of metal lattice. Behavior of material under examination is described by a system of one-dimensional hydrodynamic equations with a few-parameter equation of state. The latter models use a consistent difference scheme elaborated and presented in the paper. Code verification is performed, and models are used to calculate profiles of electron and lattice temperatures. Calculation results show good agreement with results obtained by others, and slight difference is explained by the use of consistent difference scheme. Calculation errors for pressure amplitude and shock wave speed are less than 1 %. Conditions of shock wave generation in metal films are outlined.