SMuK 2023 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 1: Laser Applications and Laser-Beam Material Interaction
K 1.5: Vortrag
Dienstag, 21. März 2023, 12:20–12:35, HSZ/0403
Double-pulse irradiation of a thin gold film using ultrafast laser radiation — •Markus Olbrich, Theo Pflug, Nick Börnert, Philipp Lungwitz, Andy Engel, Peter Lickschat, Steffen Weißmantel, and Alexander Horn — Laserinstitut Hochschule Mittweida, Technikumplatz 17, 09648 Mittweida
Irradiating a thin gold film (film thickness dz = 150 nm, 20 nm adhesion layer of chromium, float glass substrate) with a double-pulse of ultrafast laser radiation (pulse duration τH = 40 fs, wavelength λ = 800 nm, temporal delay Δ t = 400 ps, peak fluence per pulse H0 = 1.5 Hthr, Hthr ablation threshold) results in a topology of the ablation structure deviating compared to the topology of the ablation structure induced by single-pulsed ultrafast laser radiation of the same total fluence (H0 = 3.0 Hthr). We demonstrate that the origin of these different topologies is revealed by two-temperature hydrodynamics modeling (TTM-HD) and is confirmed by ultrafast imaging reflectometry. Herein, the first pulse induces an ablation of liquid material by spallation, being transformed nearly completely into a liquid-vapor mixture of high temperature by absorbing the energy of the second pulse. The omnidirectionally expanding mixture pushes the liquid non-ablated material, being a residual from the first pulse interaction, out of the interaction zone. Thus, setting the optimum delay between the two pulses can drastically increase the energy deposition and with it the material processing efficiency.