Precise drilling of steel with ultrashort pulsed solid state lasers

Christian Foehl; Detlef Breitling; Friedrich H. Dausinger

doi:10.1117/12.515612

2 September 2003 Precise drilling of steel with ultrashort pulsed solid state lasers

Christian Foehl, Detlef Breitling, Friedrich H. Dausinger

Author Affiliations +

Proceedings Volume 5121, Laser Processing of Advanced Materials and Laser Microtechnologies; (2003) https://doi.org/10.1117/12.515612
Event: Laser Processing of Advanced Materials and Laser Microtechnologies, 2002, Moscow, Russian Federation

Abstract

The accuracy of laser drilled holes in metals is limited by a relatively large amount of molten material which is produced when lasers with pulse durations in the range of nanoseconds or longer are used. In general, shortening the pulse duration down to the picosecond or femtosecond regime promises to overcome these problems. In this contribution different influences on hole quality such as energy density, beam quality, and polarization as well as processing strategies for high precision drilling of steel with ultra-short pulses are presented and discussed. A new method of polarization control is demonstrated by which the hole geometry can significantly be improved and ripples in the surface of the hole walls can be avoided during helical drilling. Furthermore, results of investigations on the influence of the ambient pressure will be presented.

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Christian Foehl, Detlef Breitling, and Friedrich H. Dausinger "Precise drilling of steel with ultrashort pulsed solid state lasers", Proc. SPIE 5121, Laser Processing of Advanced Materials and Laser Microtechnologies, (2 September 2003); https://doi.org/10.1117/12.515612

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