Berlin 2014 – scientific programme

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K: Fachverband Kurzzeitphysik

K 5: Laser-Materie-Wechselwirkung und Laseranwendungen II

K 5.4: Talk

Tuesday, March 18, 2014, 14:45–15:00, SPA SR203

Simulation of Laser Ablation of Aluminum with Double Pulses — •Johannes Roth, Armin Krauß, Jan Lotze, and Hans-Rainer Trebin — FMQ, Universität Stuttgart

Lasers are becoming a more and more important tool in cutting and shaping materials. Improving precision and effectivity is an ongoing demand in science and industry. One possibility are double pulses. Here we study laser ablation of aluminum by the two-temperature model, where the laser is modeled as a source in a continuum heat conduction equation for the electrons, whose temperature then is transferred to a molecular dynamics particle model by an electron-phonon coupling term. The melting and ablation effectivity is studied depending on the relative intensity of two Gaussian shaped laser pulses and of the time delay between two pulses. For double pulses with delay times up to 200 ps we find a behavior as observed in experiment with reduced ablation depths beyond a delay of 10 ps. Thus we can exclude increased reflectivity from laser plasma interaction as the only source of such a behavior.