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Applied Physics A

, Volume 68, Issue 5, pp 563–567 | Cite as

Polarization effects in ultrashort-pulse laser drilling

  • S. Nolte
  • C. Momma
  • G. Kamlage
  • A. Ostendorf
  • C. Fallnich
  • F. von Alvensleben
  • H. Welling
Regular paper

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.

PACS: 79.20.D; 42.62.C 

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Copyright information

© Springer-Verlag 1999

Authors and Affiliations

  • S. Nolte
    • 1
  • C. Momma
    • 1
  • G. Kamlage
    • 1
  • A. Ostendorf
    • 1
  • C. Fallnich
    • 1
  • F. von Alvensleben
    • 1
  • H. Welling
    • 1
  1. 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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