München 2019 – scientific programme

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P: Fachverband Plasmaphysik

P 10: Laser Plasmas II

P 10.4: Talk

Tuesday, March 19, 2019, 15:00–15:15, HS 20

Absorption of Ultra-short Laser Pulses on Aluminum over a Wide Range of Intensities — •Julian Wegner, Julia Kunzelmann, and Georg Pretzler — Institut für Laser- und Plasmaphysik, Heinrich Heine Universität Düsseldorf, Germany

The absorption of intense laser pulses at solid surfaces is described by various different mechanisms which act under specific conditions, respectively. In this talk we present measurements characterizing the absorption of sub 10 fs Ti:Sa-laser pulses and a maximum pulse energy of 0.5 mJ in a 4-orders-of-magnitude-range of intensities between 10¹⁴ W/cm² and 10¹⁸ W/cm². This huge range was made possible by using a novel fully reflective variable pulse energy attenuator which keeps all other spatial and spectral pulse parameters constant. Our results show significant variations of the relative absorption, which are discussed and explained in the talk.