In laser processing, the possible throughput is directly scaling with the available average laser power. To avoid unwanted thermal damage due to high pulse energy or heat accumulation during MHz-repetition rates, energy distribution over the workpiece is required. Polygon mirror scanners enable high deflection speeds and thus, a proper energy distribution within a short processing time. The requirements of laser micro processing with up to 10 kW average laser powers and high scan speeds up to 1000 m/s result in a 30 mm aperture two-dimensional polygon mirror scanner with a patented low-distortion mirror configuration. In combination with a field programmable gate array-based real-time logic, position-true high-accuracy laser switching is enabled for 2D, 2.5D, or 3D laser processing capable to drill holes in multi-pass ablation or engraving. A special developed real-time shifter module within the high-speed logic allows, in combination with external axis, the material processing on the fly and hence, processing of workpieces much larger than the scan field.
About the authors
Florian Roessler, Dr.-Ing: Born in 1991, married, 2 children; 2009–2014: Studies of mechanical engineering at Dresden University of Technology; 2014–2019: researcher associate at Dresden University of Technology, Institute of manufacturing technology in the field of large area laser-based surface functionalization using direct laser interference patterning; Doctorate at the Faculty of Mechanical Engineering, Dresden University of Technology, title of thesis: “Fabrication and applications of complex micropatterned polymers using laser interference methods”, supervisor Prof. Dr.-Ing. Andrés F. Lasagni; 2018: Young researchers award of the German Society of Materials Science (DGM); Since 2019 research and development manager at MOEWE Optical Solutions GmbH. Publications: >1 patents; >16 national and international publications. Research interests: High-speed laser scanning technology (polygon scanner) for laser material processing; High-throughput laser processing; Laser-based surface functionalization.
André Streek, Prof. Dr.-Ing: Born 1977, married, 2 children; Vocational training in computer science and electronics; Studied physical engineering and laser technology at Mittweida University of Applied Sciences; Since 2004 research and development engineer at the Laserinstitut Mittelsachsen e.V. in the field of laser microsintering; Since 2006 research associate at Mittweida University of Applied Sciences; 2007 external research associate at Philips Lighting Belgium; Doctorate at the Faculty of Mechanical Engineering, Dresden University of Technology, dissertation: “Laser Microsintering”, with Prof. Dr. habil. Eckhardt Beyer (Fraunhofer-IWS-Dresden); Managing director of MOEWE Optical Solutions GmbH. Publications: >25 patents; >50 national and international publications. Research interests: Laser-based 3D printing processes for metals and ceramics; High-speed laser scanning technology (polygon scanner) for laser material processing; High-rate laser processes using ns and cw lasers; High-speed control and regulation technology in hardware; Parallel computing and modelling using FPGA.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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