Berlin 2008 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 23: Poster session

MM 23.46: Poster

Dienstag, 26. Februar 2008, 14:45–18:00, Poster B

Laser ablation of aluminium — •Steffen Sonntag, Johannes Roth, Frank Gähler, and Hans-Rainer Trebin — Institut für Theoretische und Angewandte Physik, Universität Stuttgart, 70550 Stuttgart, Deutschland

We investigate femtosecond laser ablation of metals using a hybrid simulation scheme. Two equations are solved simultaneously: one for the electronic system, which accounts for laser energy absorption and heat conduction, the other for the dynamics of the lattice where the ablation process takes place. For the electron temperature a generalized heat conduction equation is solved by applying a finite difference scheme. For the lattice properties, e.g. pressure, density or temperature, we use common molecular dynamics. Energy transfer between the subsystems is allowed by introducing an electron-phonon coupling term. This combined treatment of the electronic and atomic systems is an extension of the well known two-temperature model [1].

Atomic scale images of the ablation process are shown. The dependence of ablation and melting depth on characteristic parameters, such as the pulse duration and the laser fluence is discussed.

[1] S.I. Anisimov, B.L. Kapeliovich and T.L. Perel’man: Sov. Phys. JETP 39, 375(1974)