Here we show that over stainless steel, it is possible to obtain different surface textures (in particular ripples, micro grooves and spikes) by utilising a 2 MHz femtosecond laser jointly with a fast and accurate polygonal scanner head at relatively low fluence (0.11 J·cm-2). The evolution of the Laser induced surface structures morphology is shown when varying the scan speed between 25 m·s-1 and 90 m·s-1. Two different wavelengths have been utilised for the process λ= 1030 nm and λ = 515 nm and the difference of the results obtained have been highlighted. Moreover, a full structures morphology characterization by SEM has been carried out for all the textured surfaces. Finally, by increasing the number of successive surface scans is possible to tailor the surface reflectivity. As a result an average reflectivity value of < 5% over the visible range has been extracted from a blackened stainless steel surface.
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G. Mincuzzi, M. Fleureau, M. Faucon, R. Kling, "Exploring polygon scanner head capabilities for ultra-short pulse laser texturing," Proc. SPIE 9736, Laser-based Micro- and Nanoprocessing X, 97360W (4 March 2016);