TresClean scientific advances are set to enable progress in the productivity levels of laser-based surface treatments by developing high-power and high-energy laser sources, together with ultrafast scanning technologies.

High-power ultrafast lasers

Surface treatment have used a high-power thin-disk multi-pass amplifier (TD-MPA) delivering a stable 1 kW of average output power at a repetition rate of 300 kHz and a pulse duration below 7 ps.

  • Saraceno, C.J., Sutter, D., Metzger, T., Abdou Ahmed, M.  The amazing progress of high-power ultrafast thin-disk lasers. J. Eur. Opt. Soc.-Rapid Publ. 15, 15 (2019).

  • Röcker, C., Graf, T., M. Abdou Ahmed, M., et al. Ultrafast thin-disk multipass laser amplifier scheme avoiding misalignment induced by natural convection of the ambient air. Opt. Eng. 58, 1 (2019).

Second and third harmonic generation of high-power beams

The generation of high average power Green (640W) and UV (264W) beams by second and third harmonic non-linear processes using LBO crystals was has been demonstrated. USTUTT has demonstrated more than 1.4kW of green radiation using components (NL optics) developed within TresClean.

 

Laser Structuring Technologies

Results have advanced knowledge on micro-structuring techniques in a one-step process, nearly arbitrary and material independent structure geometries and surface structuring.

Rates up to 500 mm²/s have been reached with the DLIP approach:

 

And up to 2000mm²/s with the LIPSS approach:

Surface functionalization to enhance surface cleanability and anti-bacterial properties

Measurement of the cleanability and antibacterial performance of materials textured with the TresClean techniques has shown that achieving ‘self-cleaning’ and antibacterial surfaces is a complex process. Both wettability and surface morphology influence cleanability and antibacterial behaviour, furthermore, neither super-hydrophobicity nor low surface roughness are sufficient to reduce initial retention of the examined bacteria. However, in a first step to optimising the surface texturing process the relationships between the laser parameters studied and hydrophobicity were uncovered together and the wettability behaviour development following laser-material interaction was identified. Furthermore, the project demonstrated the ability of laser treatment to modify metal surface properties and improve cleanability and hygiene against milk soiling.

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The TresClean project is an initiative of the Photonics Public Private Partnership and has received funding from the European Union's Horizon 2020 Research and Innovation Programme under Grant Agreement No. 687613