Mr. Evaldas Kažukauskas Profile

Evaldas Kažukauskas

at Vilnius Univ

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Proceedings Article | 25 May 2022 Poster + Paper

Numerical simulations and experimental analysis of scanning techniques for low-roughness surfaces using UV femtosecond pulses

Evaldas Kažukauskas, Simas Butkus, Domas Paipulas, Vytautas Jukna, Valdas Sirutkaitis

Proceedings Volume 12142, 1214219 (2022) https://doi.org/10.1117/12.2621763

KEYWORDS: Surface roughness, Femtosecond phenomena, Ultraviolet radiation, Laser ablation, Numerical simulations, Data modeling, Micromachining

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Surface roughness is an important parameter that has a great influence on various material properties. It determines the rate of corrosion, wettability, as well as optical properties of different materials. Low roughness (< 100 nm Ra) surfaces are difficult to achieve even with fs pulses, therefore investigation of the theoretical intricacies is of major interest when engraving transparent materials. In our study, we numerically investigate the evolution of the surface roughness when it is scanned with a UV femtosecond laser beam and compare the numerical results to the experimentally acquired values. The study contains a single scan as well as multiple scans (up to 10 scans) on the surface. We found that in the case of a single scan the dominant surface roughness determining factor is the overlap of the pulses in x and y directions. It was found, that parameters such as pulse overlap, laser-scanner synchronization, and initial beam profile strongly influence the resulting surface roughness in a nonlinear manner. In the case of a multi-scanned surface, we determined that the resulting surface roughness can be minimized by introducing rotation of every following layer at a certain angle with respect to the previous one. The angle for minimized surface roughness highly depended on system configuration. The investigated theoretical model is in good relation to the experimentally acquired results and provides valuable information when optimizing the process for minimal-roughness micromachining.

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