Laser Ablation of Solids by Molecular Dynamics
Solid State Physics
Institut für Theoretische und Angewandte Physik (ITAP)
We study the laser ablation by molecular dynamics. Femto-second
laser pulses interact with the electron gas in the material. The energy is
transmitted to the lattice which heats up the material and leads to the
expulsion of atoms or liquid drops depending on the initial conditions. A
speciality of our simulations is the two-temperature model: the electrons are
modelled as a continuum which is coupled to the molecular dynamics simulation
of the atoms.
The major goal of the proposed project, which is embedded in
the SFB 716 "`Dynamische Simulation von Systemen mit großen Teilchenzahlen"',
is to scale up the simulations as far as possible and to reach sample size
that are larger than the tiniest laser spots studied in experiment.
Further more plan research along several directions: simulating alloys, metals
covered with liquid, modeling the shape and time evolution of the laser beam,
and testing the behavior of pre-damaged samples. A major part of the SFB 716
proposal is to extend the current model from metals to covalent materials
which requires the modeling of a varying of charge carriers.