Hannover 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Hannover musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
P: Fachverband Plasmaphysik
P 20: Laser plasma and laser applications 2
P 20.1: Hauptvortrag
Donnerstag, 12. März 2020, 14:00–14:30, b302
The interaction of lasers with material using pulse durations from fs to ns — •Georg Pretzler1, Steffen Mittelmann1, Jannis Oelmann2, Julian Wegner1, and Sebastijan Brezinsek2 — 1Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf — 2Forschungszentrum Jülich, Institut für Energie- und Klimaforschung -- Plasmaphysik
We compare the interaction of lasers with different pulse durations with solid matter and focus on the effects induced in the target, like ionization, ablation, and crater formation. Experiments were performed with lasers of fs-, ps-, and ns-durations, yielding strongly differing results concerning plasma temperature, interaction depth, particle ejection and spectral line emission. The effects were analysed by the help of various types of simulations, and different energy transfer mechanisms proved to be dominant, dependent on the laser pulse duration. This allows connecting the well-known results with longer pulses to the ultra-short high-intensity regime, which might help for selecting the right laser parameters for applications. One example is discussed in the talk, namely laser induced breakdown spectroscopy (LIBS) for the diagnostics of the first wall in fusion devices, for which a series of experiments is presented using lasers with different pulse durations.