Erlangen 2022 – scientific programme
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 6: Laser-Beam Matter Interaction - Laser Applications I
K 6.3: Talk
Thursday, March 17, 2022, 11:15–11:30, K-H4
Fundamental Study of Ablation Mechanisms in Crystalline Silicon and Gold by Femtosecond Laser Pulses: Classical Approach of Two Temperature Model. — •Hardik Vaghasiya1,2, Stephan Krause1,2, and Paul-Tiberiu Miclea2,1 — 1Martin Luther University Halle-Wittenberg, ZIK Sili-nano, Halle, Germany. — 2Fraunhofer Center for Silicon Photovoltaics CSP, Germany.
A fundamental study of the interaction between ultrashort laser pulses and the material will be valuable for studying ablation characteristics and ablation performance. A theoretical analysis of ultrashort laser-matter interaction can be represented by the two-temperature model which describes the temperature of the electron or carrier and lattice in non-equilibrium conditions when ultrashort laser pulses are applied. During ultrafast irradiation, due to peculiarities between the metal energy absorption to in contrast to semiconductor, a comparative study of silicon and gold ablation mechanism presented. A 2D axial symmetry simulated ablation profiles were compared with the experimental result at fluence ranging from 1 J/cm2 to 9 J/cm2 at the wavelength of 515 nm and 180 fs laser on the silicon and gold samples. The concordance between model calculations and experimental data demonstrates that fs laser ablation of silicon is thermal in nature in a low fluence regime, whereas it is non-thermal in a high-fluence regime. On the other hand, the phase explosion mechanism is prevalent to understand the ablation characteristics of gold with fs pulses.