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P: Fachverband Plasmaphysik

P 11: Laser plasma and laser applications 1

P 11.6: Vortrag

Mittwoch, 11. März 2020, 12:30–12:45, b302

Pump-probe experiments with 10 fs resolution for revealing the early phase of laser plasma evolution — •Maximilian Münzberg, Michael Stumpf, and Georg Pretzler — Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf

We present the results of an experiment in which the onset of plasma expansion has been investigated. Ultrashort laser-pulses (8 fs) with intensities of 2·10¹⁷   W/cm² are focused onto flat metallic surfaces. A synchronized ultrashort probe beam was reflected at the developing plasma at various delays with a time resolution close to 10 fs. The wave front deformation of the probe pulse was investigated by a Mach-Zehnder interferometer. In total, we determined the temporal evolution of the electron distribution at the solid-vacuum interface. We present the results for different target geometries, e.g. a bulk metal target and target with surface layers and discuss them together with PIC simulations, which show and explain a high dependence in the early expansion stage of the surface structure of the different targets.