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Distortion-free laser beam shaping for material processing using a digital micromirror device

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Abstract

Digital micromirror devices (DMD) are increasingly used in laser-based manufacturing for a maskless beam shaping in order to realize simultaneous 2D/3D material processing. Thereby, the DMD has to be irradiated under a sharp angle to achieve acceptable projection quality with negligible distortion phenomena. In this article, we present a novel setup for DMD-based laser material processing. It enables the irradiation under large angles (up to 60\(^{\circ }\)), the reduction of optical elements as well as machine size. Occurring optical distortions during the amplitude-based laser beam shaping are characterized. To eliminate these phenomena, we implement an optical modelling of the DMD patterns, taking into account the propagation through the tilted interfaces. The resulting imaging of different desired shapes is verified experimentally for its geometrical properties such as length, radius and aspect ratio. Thereby, an angle-dependent correction and high shape accuracy of the image projection is shown. This novel arrangement may have applications in direct laser writing and photochemical machining.

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Acknowledgements

The authors thank the German Research Foundation (DFG) for funding the project DMD-Jet of the Priority Program SPP1476 (VO 530/48-2).

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Authors and Affiliations

  1. BIAS-Bremer Institut fuer angewandte Strahltechnik, Klagenfurter Str. 5, 28359, Bremen, Germany

    Hamza Messaoudi, Fabian Thiemicke & Claas Falldorf

  2. MAPEX Center for Materials and Processes and Faculty of Physics and Electrical Engineering, Applied Optics, University of Bremen, Otto Hahn Allee 1, 28359, Bremen, Germany

    Ralf B. Bergmann

  3. Faculty of Production Engineering-Mechanical Engineering and Process Engineering, University of Bremen, Badgasteiner Str. 1, 28359, Bremen, Germany

    Frank Vollertsen

Authors
  1. Hamza Messaoudi
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  2. Fabian Thiemicke
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  3. Claas Falldorf
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  4. Ralf B. Bergmann
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  5. Frank Vollertsen
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Correspondence to Hamza Messaoudi.

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Messaoudi, H., Thiemicke, F., Falldorf, C. et al. Distortion-free laser beam shaping for material processing using a digital micromirror device. Prod. Eng. Res. Devel. 11, 365–371 (2017). https://doi.org/10.1007/s11740-017-0722-y

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  • DOI: https://doi.org/10.1007/s11740-017-0722-y

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