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Proceedings Paper

Micro drilling using deformable mirror for beam shaping of ultra-short laser pulses
Author(s): Marco Smarra; Anja Strube; Klaus Dickmann
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Paper Abstract

Using ultra-short laser pulses for micro structuring or drilling applications reduces the thermal influence to the surrounding material. The best achievable beam profile equals a Gaussian beam. Drilling with this beam profile results in cylindrical holes. To vary the shape of the holes, the beam can either be scanned or – for single pulse and percussion drilling – manipulated by masks or lenses. A high flexible method for beam shaping can be realized by using a deformable mirror. This mirror contains a piezo-electric ceramic, which can be deformed by an electric potential. By separating the ceramic into independent controllable segments, the shape of the surface can be varied individually. Due to the closed surface of the mirror, there is no loss of intensity due to diffraction. The mirror deformation is controlled by Zernike polynomials and results e.g. in a lens behavior. In this study a deformable mirror was used to generate e.g. slits in thin steel foils by percussion drilling using ultra-short laser pulses. The influence of the cylindrical deformation to the laser beam and the resulting geometry of the generated holes was studied. It was demonstrated that due to the high update rate up to 150 Hz the mirror surface can be varied in each scan cycle, which results in a high flexible drilling process.

Paper Details

Date Published: 4 March 2016
PDF: 14 pages
Proc. SPIE 9736, Laser-based Micro- and Nanoprocessing X, 97360S (4 March 2016); doi: 10.1117/12.2209600
Show Author Affiliations
Marco Smarra, Fachhochschule Münster (Germany)
Anja Strube, Fachhochschule Münster (Germany)
Klaus Dickmann, Fachhochschule Münster (Germany)

Published in SPIE Proceedings Vol. 9736:
Laser-based Micro- and Nanoprocessing X
Udo Klotzbach; Kunihiko Washio; Craig B. Arnold, Editor(s)

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