Bremen 2017 – wissenschaftliches Programm
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K: Fachverband Kurzzeitphysik
K 3: Laseranwendungen und Laserstrahlwechselwirkung II
K 3.2: Vortrag
Dienstag, 14. März 2017, 14:35–14:55, GW2 B2890
Simulation of the onset conditions of a fs-laser induced plasma and micro shock wave generation — •Marvin Tammen1,2, Yun Kai1,2, Theodor Schlegel1, Walter Garen1, and Ulrich Teubner1,2 — 1Hochschule Emden/Leer, Institute for Laser and Optics — 2Carl von Ossietzky University of Oldenburg, Institute of Physics
Downscaling of shock waves towards micro scale is a development direction of shock waves research. In the current work, a femtosecond laser is applied to generate a micro plasma in a thin metal film as a target. The high pressure and high temperature plasma subsequently emits a strong shock wave, which is the nature*s way to get out of the non-equilibrium state and quickly achieve balance. Of course, the early stage of the shock wave onset is extremely difficult to measure, experimentally. Thus, in addition to set-up an advanced diagnostics, comprehensive simulations are important. This presentation focuses on the theoretical side of the project, namely a computer simulation using the hydrodynamic code MULTIFS. The code takes into account the equations of states of the ions and electrons, material properties, opacity, radiation transport, heat conduction and the laser beam energy deposition mechanism and it delivers the distribution of pressure, density and temperature of the target and the surround materials (in this case, e.g., ambient air). The density (or pressure) peak corresponds to the shock wave front. Via this simulation, important shock wave onset properties including the Mach number can be derived.This project is funded by DFG.