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Proceedings Paper

Modeling and investigation of melt ejection dynamics for laser drilling with short pulses
Author(s): Andreas Ruf; Detlef Breitling; Peter Berger; Friedrich Dausinger; Helmut Huegel
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Paper Abstract

The presence of melt during the laser drilling process always signifies a balance between an efficient material removal in molten form and a reduction of quality due to recast on the hole walls and near the crater entrance. Earlier investigations have demonstrated that by reducing the laser pulse duration the amount of produced melt can be decreased and hence, the precision increased. Nevertheless, they also demonstrate that melt can never be avoided completely. Therefore, to achieve an optimum balance between efficiency and quality by a preferably complete expulsion of melt the physical fundamentals of its generation and ejection have to be understood. By applying several different analytical and numerical models ranging from simple estimations to multi-dimensional simulations, the authors will outline the peculiarities of the melt formation and dynamics during the drilling with short and ultra-short laser pulses. Since these calculations demonstrate the importance of the consideration of melt acceleration and geometric aspects, special interest will be taken in these matters. While the evaporation stops soon after the laser pulse, the melt ejection may continue until the complete solidification of the material. For a better understanding and verification, the results of the models will be compared to experimental data.

Paper Details

Date Published: 19 February 2003
PDF: 6 pages
Proc. SPIE 4830, Third International Symposium on Laser Precision Microfabrication, (19 February 2003); doi: 10.1117/12.486555
Show Author Affiliations
Andreas Ruf, Univ. of Stuttgart (Germany)
Detlef Breitling, Univ. of Stuttgart (Germany)
Peter Berger, Univ. of Stuttgart (Germany)
Friedrich Dausinger, Univ. of Stuttgart (Germany)
Helmut Huegel, Univ. of Stuttgart (Germany)

Published in SPIE Proceedings Vol. 4830:
Third International Symposium on Laser Precision Microfabrication
Isamu Miyamoto; Kojiro F. Kobayashi; Koji Sugioka; Reinhart Poprawe; Henry Helvajian, Editor(s)

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