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P: Fachverband Plasmaphysik

P 21: Laser Plasmas - Poster

P 21.8: Poster

Mittwoch, 7. März 2018, 16:15–18:15, Zelt West

Observation of two expansion phases of a sub-10-fs laser-produced plasma on an aluminum surface — •Michael Stumpf and Georg Pretzler — Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf

We measured the temporal development of the spatial electron distribution in front of a laser-pumped aluminum surface using a novel pump-probe setup with a time resolution below 15 fs. The laser pulse reached a maximum intensity of 2.4·10¹⁷ W/cm² over a pulse duration of 9 fs. We can clearly separate two phases of expansion with different time scales. This indicates two different mechanisms, namely a fast laser-driven and a slower plasma-driven one. We developed an intuitive model to describe these expansion processes qualitatively and compared the results quantitatively with numerical simulations.