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K: Fachverband Kurzzeitphysik

K 6: Poster

K 6.3: Poster

Tuesday, February 26, 2013, 16:30–18:30, Poster EG

Helical drilling with Ultrashort Laser Pulses — •Anne Feuer¹, Martin Kraus², Rudolf Weber¹, and Thomas Graf¹ — ¹Institut für Strahlwerkzeuge (IFSW), University of Stuttgart, Pfaffenwaldring 43, D-70569 Stuttgart, Germany — ²Robert Bosch GmbH, Wernerstraße 51, D-70469 Stuttgart, Germany

Ultrashort pulsed laser radiation enables directed application of energy in the work piece while minimizing thermal conduction due to the short time scale of the laser pulses. With it, thermal effects such as melt generation and recast formation in metals are minimized and enables the fabrication of microholes with very high accuracy and quality [1-2]. In this research work a picosecond pulsed laser at a wavelength of 532 nm was used. In order to achieve the required quality of the microholes the process of helical drilling was applied using a specially designed optics. Microholes with average outlet diameters down to 25 µm have been achieved in metal with a material thickness of 240 µm. Thereby the averaged roundness was better than 6%. The standard deviation of the variation of the outlet area was less than 2.5%. Microhole arrays with 1950 microholes have been fabricated on a surface of about 60 mm² that will be presented in this contribution.

[1] D. Breitling, C. Föhl, F. Dausinger, T. Kononenko and V. Konov, in Femtosecond Technology for Technical and Medical Applications, F. Dausinger, F. Lichtner and H. Lubatschowski, eds. (Springer, Berlin, 2004).

[2] M. Kraus, S. Collmer, S. Sommer and F. Dausinger, “Microdrilling in steel with frequency-doubled ultrashort pulsed laser radiation”, J. Laser Micro/Nanoengineering 3, 129-134 (2008).