4 March 2016 Exploring polygon scanner head capabilities for ultra-short pulse laser texturing
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Proceedings Volume 9736, Laser-based Micro- and Nanoprocessing X; 97360W (2016) https://doi.org/10.1117/12.2208657
Event: SPIE LASE, 2016, San Francisco, California, United States
The combination of both, fast beam scanning systems and high repetition rate, high average power lasers, represents an interesting technological solution for surface texturing by Ultra-Short Pulses Laser to gain a foothold into industrial environment for commercial purposes. Nevertheless unwanted thermal effects are expected when the average power exceeds some tens of W. An interesting strategy for a reliable heat management would consists of texturing surfaces with a low fluence values (slightly higher than the ablation threshold) and utilising a polygon scanning head which is able to deflect the laser beam with unprecedented speed.

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.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. Mincuzzi, G. Mincuzzi, M. Fleureau, M. Fleureau, M. Faucon, M. Faucon, R. Kling, 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); doi: 10.1117/12.2208657; https://doi.org/10.1117/12.2208657

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