MSE 2024
Poster
Fabricating hierarchical surface patterns on metals using polygon scanners and direct laser interference patterning
AL

Prof. Dr.-Ing. Andrés Fabián Lasagni

Technische Universität Dresden

Baumann, R.¹; Li, Y.¹; Lasagni, A.F. (Speaker)²
¹Technische Universität Dresden; ²Fraunhofer Institute for Material and Beam Technology IWS Dresden

Laser-based surface texturing methods have shown to be able to functionalize surfaces by producing ordered surface elements with feature sizes from the micrometer to the sub-micrometer range. In addition, by combining topographical elements with different sizes simultaneously, the properties of the laser-treated surfaces can be enhanced or multifunctional surfaces can be created. In this study, two well-known laser methods, namely Direct Laser Interference Patterning (DLIP) and Polygon Scanner Structuring (PSS), are combined to produce hierarchical surface structures on metallic surfaces. Different process parameters are evaluated, including laser power, laser polarization as well as the sequence in which the DLIP and PSS methods are used. The polygon scanner process used a high power laser source (Edgewave PX600, Germany) with a maximum output power of 500 W. The used wavelength was 1064 nm and the pulse duration was 12 ps. The hatch distance was varied between 95 μm and 195 μm, and up to 150 over-scans were performed. For the DLIP process, also an IR laser source was used (Edgewave PX200, Germany) delivering 10 ps pulses at a laser wavelength is 1064 nm. The maximal available laser power was 70 W. The pulse-to-pulse overlap was varied from 67 to 93% and the spatial period was fixed to 2.6 μm. Finally, the produced topographies are characterized using confocal and scanning electron microscopy.

Abstract

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