Bonn 2025 – scientific programme

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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 5: Laser-Beam Matter Interaction – Light and Radiation Sources II

K 5.1: Invited Talk

Tuesday, March 11, 2025, 11:00–11:30, HS XI ITW

Fundamental investigations on the ablation of thin metallic films upon irradiation with ultrafast laser radiation — •Alexander Horn, Theo Pflug, Andy Engel, and Markus Olbrich — Laserinstitut Hochschule Mittweida

Understanding the fundamental processes of ablation induced by the irradiation with ultrafast laser radiation represents the key parameter in explaining the results of laser-material processing. By combining our complementary ultrafast metrology such as pump-probe imaging reflectometry, interferometry, and spectroscopy the dynamic of ablation can be determined by measuring the change of the optical properties from the femtosecond up to the microsecond range. Additionally, a modeling of the interaction of the laser radiation with the material must be performed to assign the changes of the optical properties to physical processes such as excitation of the electron system, generation of shockwaves, spallation, and phase explosion or the expansion of the induced ablation plume. The modeling includes the two-temperature model in combination with the hydrodynamics (TTM-HD) as well as the beam propagation of the probe radiation.

Keywords: ultrafast metrology; spallation and phase explosion; two-temperature model; femtosecond laser radiation