• TresClean

TresClean Project Achieves Two Major Goals

The TresClean project has now achieved another two major goals. Firstly, 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 10 ps was successfully implemented. Secondly, the generation of high average power Green (640W) and UV (264W) beams by second and third harmonic non-linear processes using LBO crystals was demonstrated.

These results represent solid improvements over commercially available laser systems and have important implications for the future of material processing with high average power, high energy ultra-short pulsed lasers. To achieve these outcomes, USTUTT focused on the implementation of a thin-disk multi-pass amplifier architecture [1].

The project objectives of 500W green and 100W UV beam generation were also successfully achieved and even exceeded by 28% and 37%, respectively. The original project goals were 500W at 515 nm (green) at an efficiency >= 60% and 100W at 343 nm (UV) at an efficiency >= 25%. Up to 640W of average output power for second harmonic generation (green) was demonstrated at an excellent efficiency of 70% and a beam quality (M2) of less than 1.2 on both axes. 264W of output power was achieved for third harmonic generation (UV) at the cost of beam quality degradation. At 137W of UV output power, however, the beam quality was measured to be below 1.4 on both axes. With these results, all objectives relating to non-linear conversion stages were fulfilled.

The project is now currently focusing on the integration of laser sources into processing machines for subsequent large-area texturing of steel using LIPSS and DLIP processes.

TresClean is led by a European consortium comprising 7 partners with extensive expertise from across the continent, including Università degli Studi di Parma (UNIPR - Italy), Universitaet Stuttgart (USTUTT - Germany), Centre Technologique ALPhANOV (ALPhANOV - France), Raylase GmbH (RAYLASE - Germany), Ecor International (ECOR - Italy), BSH Electodomesticos España SA (BSH - Spain) and Modus Research and Innovation Ltd (MODUS - UK). Initiating in April 2016, the project has been ongoing for 38 months. The project has been granted 3.3 M€ in funding from the European Union’s H2020 ICT 2015. For further details and to follow the work progress, please visit TresClean’s website on

Refs: 1- M. Abdou Ahmed et al., "Development of high-power thin-disk lasers: status and perspectives," invited talk presented at the JNPLI, Strasbourg, France, 2017.