Deep drilling of metals by femtosecond laser pulses |
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Authors: | G Kamlage T Bauer A Ostendorf BN Chichkov |
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Institution: | (1) Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany, DE |
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Abstract: | Results of recent investigations on deep drilling of metals by femtosecond laser pulses are reported. At high laser fluences,
well above the ablation threshold, femtosecond lasers can drill deep, high-quality holes in metals without any post-processing
or special gas environment. It is shown that for high-quality drilling of metals, the following processes are important: (1)
laser-induced optical breakdown of air containing metal vapor and small metal particles (debris) generated by multi-pulse
femtosecond laser ablation, (2) transformation of laser pulses into light filaments, and (3) low-fluence finishing.
Received: 15 November 2002 / Accepted: 20 January 2003 / Published online: 28 May 2003
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ID="*"Corresponding author. Fax: +49-511/2788-100, E-mail: ch@lzh.de |
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Keywords: | PACS: 42 62 Cf 42 65 Re 52 38 Mf |
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