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Proceedings Paper

Laser-induced generation of shaped holes by variable beam shaping
Author(s): Andreas Stephen; Simeon Metev; Werner Jüptner; Frank Vollertsen
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Paper Abstract

In this paper we report on a new method for the generation of shaped holes by dynamical variation of the beam shape with a special optical system. It is based on using a q-switched Nd:YAG laser with 100 ns pulses at a wavelength of 1064 nm and an optical setup producing a photon tube. By variation of the beam divergence the shape of the photon tube can be variably modified. The optical system consists of a specially designed Galilean telescope and a focusing objective. The beam divergence can be changed in-situ by the Galilean telescope while processing. This enables to control diameter, length and angle of the photon tube. Shaped controlled structures are processed applying in-situ different optical fields which have been previously defined by simulations including aberrations and diffraction effects. As an example, the variable beam shaping resulted in through-going cylindrical bores as well as such ones with a defined conical inlet with respect to its taper angle and depth. Taper angles between 1 and nearly 50 degrees were realized by varying both the beam divergence and laser power. Furthermore, the variable beam shaping leads to improved and almost debris-free machining efficiency.

Paper Details

Date Published: 9 December 2005
PDF: 8 pages
Proc. SPIE 6157, Workshop on Laser Applications in Europe, 61570I (9 December 2005); doi: 10.1117/12.661207
Show Author Affiliations
Andreas Stephen, Bremer Institut für angewandte Strahltechnik (Germany)
Simeon Metev, Bremer Institut für angewandte Strahltechnik (Germany)
Werner Jüptner, Bremer Institut für angewandte Strahltechnik (Germany)
Frank Vollertsen, Bremer Institut für angewandte Strahltechnik (Germany)

Published in SPIE Proceedings Vol. 6157:
Workshop on Laser Applications in Europe
Wolfgang Gries; Thomas P. Pearsall, Editor(s)

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