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19 February 2003 Surface structuring of metals with ultrashort laser pulses
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Proceedings Volume 4830, Third International Symposium on Laser Precision Microfabrication; (2003)
Event: LAMP 2002: International Congress on Laser Advanced Materials Processing, 2002, Osaka, Japan
In recent years industry has shown a growing interest in the field of micro-structuring of surfaces on macroscopic workpieces. Several applications to improve the tribological properties of surfaces are known as well as various techniques for printing and embossing. Today the availability of lasers with the appropriate reliability for industrial applications limits the pulse durations to nanoseconds or longer. However, the quality of the resulting structures is limited, especially in metals, due to the formation of melt that has to be removed by additional post-processing. Several earlier published experimental results have shown that it is possible to avoid melt deposition by shortening the pulse duration into the femtosecond regime. This contribution will present results in the field of microsurface-structuring of metals with ultrashort laser pulses. It was found that femtosecond pulses alone are not sufficient to obtain structures free of recast. Melt free material processing is only possible in a restricted parameter window. With current laser sources, process speed is too slow for the economical use in the industrial production. To explore the potential of high repetition rate lasers, experiments with an appropriate laser source were carried out.
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Michael Weikert, Christian Foehl, and Friedrich Dausinger "Surface structuring of metals with ultrashort laser pulses", Proc. SPIE 4830, Third International Symposium on Laser Precision Microfabrication, (19 February 2003);


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