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Beam shaping using two spatial light modulators for ultrashort pulse laser ablation of metals
Author(s): Dmitriy Mikhaylov; Thomas Kiedrowski; Andrés F. Lasagni
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Paper Abstract

In this study, an optical setup based on two phase-only spatial light modulators is presented, capable to shape two parallel laser beams. Each of the light modulators creates different and complementary Gaussian multi-spot distributions in the focal plane. By the polarization based combination of two differently shaped beams, a multi-spot beam profile with higher multi-spot density than for a single spatial light modulator setup can be obtained without speckles to appear. Beam shaping results are characterized by means of a beam profile camera and compared to a single spatial light modulator setup. Beam shapes generated by the presented setup are applied to ultrashort pulse laser ablation of metals. The potential of the presented optics is discussed regarding ground roughness and waviness of the ablated structure.

Paper Details

Date Published: 4 March 2019
PDF: 11 pages
Proc. SPIE 10906, Laser-based Micro- and Nanoprocessing XIII, 1090615 (4 March 2019); doi: 10.1117/12.2508682
Show Author Affiliations
Dmitriy Mikhaylov, Robert Bosch Manufacturing Solutions GmbH (Germany)
TU Dresden (Germany)
Thomas Kiedrowski, Robert Bosch GmbH (Germany)
Andrés F. Lasagni, TU Dresden (Germany)
Fraunhofer Institut für Werkstoff- und Strahltechnik (Germany)

Published in SPIE Proceedings Vol. 10906:
Laser-based Micro- and Nanoprocessing XIII
Udo Klotzbach; Akira Watanabe; Rainer Kling, Editor(s)

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