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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 1: Laser Applications and Laser-Beam Material Interaction
K 1.2: Talk
Tuesday, March 21, 2023, 11:35–11:50, HSZ/0403
Validation of two-temperature hydrodynamics modeling by in-situ metrology and ex-situ analysis of the microstructure of a thin gold film — •Markus Olbrich1, Theo Pflug1, Christina Wüstefeld2, Mykhaylo Motylenko2, Christiane Wächtler2, David Rafaja2, Stefan Sandfeld3, and Alexander Horn1 — 1Laserinstitut Hochschule Mittweida — 2Institute of Materials Science, TU Bergakademie Freiberg — 3Institute for Advanced Simulation, Forschungszentrum Juelich GmbH
Irradiating a thin gold film (film thickness dz = 150 nm, 20 nm adhesion layer of chromium, fused silica substrate) with single-pulsed ultrafast laser radiation (pulse duration τH = 40 fs, wavelength λ = 800 nm, peak fluence H0 = 1.4 J/cm2) results in a flat ablation structure with a constant ablation depth, being replicable by two-temperature hydrodynamics modeling (TTM-HD). For validating the model, ultrafast imaging reflectometry is applied within a temporal range of up to 50 µs after the irradiation, resulting in a good agreement between the simulated electron temperature and the simulated dynamics of the ablated material with the measured change of reflectance. The modeling is further validated by comparing the calculated temperature and pressure distributions to the change of the microstructure and the diffusion depth of chromium into the gold film. The microstructure was investigated by electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). Concentration profiles of chromium were determined by energy dispersive X-ray spectroscopy (EDS) performed on cross-sections in the scanning transmission electron mode (STEM).