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Development of an analytical model for optimization of direct laser interference patterning

: Voisiat, Bogdan; Aguilar Morales, Alfredo Ismael; Kunze, Tim; Lasagni, Andrés-Fabián

Fulltext ()

Materials 13 (2020), No.1, Art. 200, 10 pp.
ISSN: 1996-1944
European Commission EC
H2020; 675063; LASER4FUN
Deutsche Forschungsgemeinschaft DFG
Reinhart-Koselleck-Projekt; 323477257
Journal Article, Electronic Publication
Fraunhofer IWS ()
Direct laser interference patterning; line-like structure; Stainless steel; laser ablation; analytical model; process optimization; microstructure

Direct laser interference patterning (DLIP) has proven to be a fast and, at the same time, high-resolution process for the fabrication of large-area surface structures. In order to provide structures with adequate quality and defined morphology at the fastest possible fabrication speed, the processing parameters have to be carefully selected. In this work, an analytical model was developed and verified by experimental data, which allows calculating the morphological properties of periodic structures as a function of most relevant laser-processing parameters. The developed model permits to improve the process throughput by optimizing the laser spot diameter, as well as pulse energy, and repetition rate. The model was developed for the structures formed by a single scan of the beam in one direction. To validate the model, microstructures with a 5.5 µm spatial period were fabricated on stainless steel by means of picosecond DLIP (10 ps), using a laser source operating at a 1064 nm wavelength. The results showed a difference of only 10% compared to the experimental results.