Erlangen 2022 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 2: Poster
K 2.10: Poster
Dienstag, 15. März 2022, 16:30–18:30, P
Electron-Lattice Relaxation Time Dynamics and Separation Time Dynamic of Multiple Pulses Femtosecond Laser Ablation Process on Gold. — •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
To study the ultrashort laser pulse interaction on gold, a set of coupled partial differential equations of the two-temperature model was solved in the spatial and time domains with dynamic optical properties and phase explosion mechanism. In an extended Drude model considering interband transitions, the reflectivity and absorption coefficient are contemplated based on the electron relaxation time. The laser energy deposition and phase explosion ablation mechanism are analyzed in the case of succession of fs-laser pulses (180 fs, 1030 nm) on gold with experimental results. The simulation results demonstrate that by increasing the number of pulses with a shorter separation time compared to electron-lattice relaxation time, lattice temperature can be considerably increased without a noticeable increase in ablation depth. In the study of multiple pulses fs laser ablation, the computational model indicates that succession of laser pulses with a pulse separation time of 50 ps or longer can significantly boost the ablation rate at the same laser fluence. Thus, the deviation from experimental and simulation results gives rise to the conclusion that temporal pulse manipulation with separation time greater than the electron-lattice relaxation time is a useful technique for fast femtosecond laser processing.