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Fabrication of hierarchical surface textures using multi-pulse direct laser interference patterning with nanosecond pulses

 
: El-Khoury, Mikhael; Alamri, Sabri; Voisiat, Bogdan; Kunze, Tim; Lasagni, Andrés-Fabián

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Materials letters 258 (2020), Art. 126743
ISSN: 0167-577X
European Commission EC
H2020; 768701; SHARK
Laser surface engineering for new and enhanced functional performance with digitally enabled knowledge base
Englisch
Zeitschriftenaufsatz
Fraunhofer IWS ()
direct laser interference patterning; laser surface microstructuring; nanosecond pulsed laser; multi-scale structure

Abstract
In this study, we report on the one-step fabrication of hierarchical microstructures on stainless steel substrates using multi-pulse Direct Laser Interference Patterning. The complex structures are produced using a two-beam interference setup with nanosecond laser pulses. The effect of laser fluence and number of pulses on the formation of multi-scale microstructures is systematically investigated. The resulting surface structures are characterized by scanning electron microscopy and white light interference microscopy. It was observed that at low laser fluence, the periodic microstructures remain defined and grow in height above the initial surface, independent on the number of pulses. For higher laser fluences as well as larger number of pulses, the structures adopt a crater-like morphology including a periodic line-like structure.

: http://publica.fraunhofer.de/dokumente/N-561943.html