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Proceedings Paper

Active optical system for advanced 3D surface structuring by laser remelting
Author(s): O. Pütsch; André Temmler; J. Stollenwerk; E. Willenborg; P. Loosen
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Paper Abstract

Structuring by laser remelting enables completely new possibilities for designing surfaces since material is redistributed but not wasted. In addition to technological advantages, cost and time benefits yield from shortened process times, the avoidance of harmful chemicals and the elimination of subsequent finishing steps such as cleaning and polishing. The functional principle requires a completely new optical machine technology that maintains the spatial and temporal superposition and manipulation of three different laser beams emitted from two laser sources of different wavelength. The optical system has already been developed and demonstrated for the processing of flat samples of hot and cold working steel. However, since particularly the structuring of 3D-injection molds represents an application example of high innovation potential, the optical system has to take into account the elliptical beam geometry that occurs when the laser beams irradiate a curved surface. To take full advantage of structuring by remelting for the processing of 3D surfaces, additional optical functionality, called EPS (elliptical pre-shaping) has to be integrated into the existing set-up. The development of the beam shaping devices not only requires the analysis of the mechanisms of the beam projection but also a suitable optical design. Both aspects are discussed in this paper.

Paper Details

Date Published: 9 March 2015
PDF: 10 pages
Proc. SPIE 9356, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications IV, 93560U (9 March 2015); doi: 10.1117/12.2076051
Show Author Affiliations
O. Pütsch, RWTH Aachen Univ. (Germany)
André Temmler, RWTH Aachen (Germany)
J. Stollenwerk, RWTH Aachen Univ. (Germany)
Fraunhofer Institute for Laser Technology (Germany)
E. Willenborg, Fraunhofer Institute for Laser Technology (Germany)
P. Loosen, RWTH Aachen Univ. (Germany)
Fraunhofer Institute for Laser Technology (Germany)


Published in SPIE Proceedings Vol. 9356:
High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications IV
Friedhelm Dorsch, Editor(s)

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