Abstract: This paper is focused on the systematic computer-based numerical
research of processes taking place during laser/matter interaction on the
nanosecond time scale. Special attention is paid to the dynamics of a laser
with passive Q-switch and intra-cavity nonlinear frequency doubling. The model
accounts for the whole set of processes: laser beam attenuation and absorption
in the material, heat generation, heat diffusion, phase transitions (solid to
liquid, liquid to gaseous state), material removal and melted material
re-solidification. Through analysis and simulation of the laser model, we
investigate the laser pulse formation and laser parameter optimization.
Numerical experiments are used to explain crater shapes, rate of material
removal, dependence on laser pulse duration, etc.
