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Proceedings Paper

Precise drilling with short-pulsed lasers
Author(s): Friedrich Dausinger
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Paper Abstract

Laser drilling is the oldest production technique using lasers. Nevertheless, the number of industrial applications is lying far behind of those of marking, cutting and welding. In cases when high accuracy is required, like for instance fuel injection nozzles, laser drilling could not fulfill the requirements, up to now. The major problem is the relatively large amount of molten material produced when using common drilling lasers with pulse durations in the order of one millisecond. Shortening the pulse length down to the femtosecond range is widely proposed as a recipe to avoid melt, now. The required laser systems, however, seem to need some years of ripening before they can be used in industrial environment. On the other hand, reliable and powerful diode pumped solid state lasers with pulse durations in the order of 10 nanoseconds are on the market now. Picosecond systems are available as laboratory setup. The paper presents drilling results obtained in both pulse regimes with fundamental and higher harmonic wavelengths. With a new drilling procedure, the so called helical drilling, an unprecedented level of accuracy could be achieved. A model allowing to explain experimental results will be offered.

Paper Details

Date Published: 7 February 2000
PDF: 8 pages
Proc. SPIE 3888, High-Power Lasers in Manufacturing, (7 February 2000); doi: 10.1117/12.377015
Show Author Affiliations
Friedrich Dausinger, Univ. Stuttgart (Germany)

Published in SPIE Proceedings Vol. 3888:
High-Power Lasers in Manufacturing
Xiangli Chen; Tomoo Fujioka; Akira Matsunawa, Editor(s)

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