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Proceedings Paper

Diffractive beam shaping for enhanced laser polymer welding
Author(s): J. Rauschenberger; Daniel Vogler; C. Raab; U. Gubler
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Paper Abstract

Laser welding of polymers increasingly finds application in a large number of industries such as medical technology, automotive, consumer electronics, textiles or packaging. More and more, it replaces other welding technologies for polymers, e. g. hot-plate, vibration or ultrasonic welding. At the same rate, demands on the quality of the weld, the flexibility of the production system and on processing speed have increased.

Traditionally, diode lasers were employed for plastic welding with flat-top beam profiles. With the advent of fiber lasers with excellent beam quality, the possibility to modify and optimize the beam profile by beam-shaping elements has opened.

Diffractive optical elements (DOE) can play a crucial role in optimizing the laser intensity profile towards the optimal M-shape beam for enhanced weld seam quality. We present results on significantly improved weld seam width constancy and enlarged process windows compared to Gaussian or flat-top beam profiles. Configurations in which the laser beam diameter and shape can be adapted and optimized without changing or aligning the laser, fiber-optic cable or optical head are shown.

Paper Details

Date Published: 12 March 2015
PDF: 8 pages
Proc. SPIE 9351, Laser-based Micro- and Nanoprocessing IX, 935110 (12 March 2015); doi: 10.1117/12.2080273
Show Author Affiliations
J. Rauschenberger, Leister Technologies AG (Switzerland)
Daniel Vogler, Leister Technologies AG (Switzerland)
C. Raab, Leister Technologies AG (Switzerland)
U. Gubler, Leister Technologies AG (Switzerland)

Published in SPIE Proceedings Vol. 9351:
Laser-based Micro- and Nanoprocessing IX
Udo Klotzbach; Kunihiko Washio; Craig B. Arnold, Editor(s)

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