Hannover 2020 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 11: Laser plasma and laser applications 1

P 11.3: Vortrag

Mittwoch, 11. März 2020, 11:45–12:00, b302

Laser Harmonic Generation on a Plasma Blister on the Surface of a Solid — •Bastian Hagmeister and Georg Pretzler — Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf

The interaction of an intense femtosecond laser pulse (10¹⁷ W/cm²) with solids is well understood but there are still new effects to explore. The nonlinear process of harmonic generation depends strongly on the conditions of the pre-plasma and the laser pulse contrast. Typically, the pedestal of an intense laser pulse disturbs this process, however, in some cases it transforms the setting.
In the following, we show that harmonics can be generated on the surface of a plasma blister with high efficiency. This plasma blister is generated by the amplified spontaneous emission (ASE) accompanying the laser pulse. The ASE hits the surface of the solid a few nanoseconds before the laser pulse and generates the plasma blister. By adjusting the delay between the laser pulse and the ASE, the blister size can be modified. Due to this expansion, the harmonics, which arise on the blister surface, have a different direction from harmonics generated on the target surface.