Polarization effects in ultrashort-pulse laser drilling |
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| Authors: | S Nolte C Momma G Kamlage A Ostendorf C Fallnich F von Alvensleben H Welling |
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| Institution: | (1) Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany (Fax: +49-511/2788-100, E-mail: sn@lzh.de), DE |
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| Abstract: | A strong influence of the polarization of the laser radiation on the geometry of laser-machined microdrillings has been observed
for ultrashort pulses. For drillings with a certain aspect ratio, reflections at the hole walls take place, leading to a non-uniform
intensity distribution deep inside the formed hole. Experimental and theoretical results on this subject are discussed. It
is shown that a rotation of the polarization during the drilling process (“polarization trepanning”) significantly improves
the quality of the produced holes.
Received: 21 August 1998 / Accepted: 25 November 1998 / Published online: 17 March 1999 |
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| Keywords: | PACS: 79 20 D 42 62 C |
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