Bremen 2017 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 12: Theory and Modelling I

P 12.5: Poster

Dienstag, 14. März 2017, 16:30–18:30, HS Foyer

Molecular Dynamics Simulations Of Laser Ablation and Plasma Formation — Eugen Eisfeld and •Johannes Roth — Universität Stuttgart

Laser ablation is studied with classical molecular dynamics simulations. The interaction of ultrashort laser pulses with a metallic material is modeled using a hybdrid two-temperature model with separate temperatures for the electrons and the lattice. We have implemented an ionization model based on the Thomas-Fermi theory as well as wide-range models for the complex permittivity, the electronic heat conductivity and the electron-phonon coupling parameter, similar to the work of Povarnitsyn [1] which describes the transition from the metal to the plasma state.

The laser absorption is calculated by solving the Helmholtz wave equation instead of the simple Lambert-Beer law. The improved results are compared to simulations carried out with hydrodynamic simulations.

[1] Povarnitsyn et al., Appl. Surf. Sci. 258 (2012) 9480.