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Laser shock processing with 20 MW laser pulses delivered by optical fibers

Published online by Cambridge University Press:  15 March 2000

T. Schmidt-Uhlig ,
P. Karlitschek ,
M. Yoda ,
Y. Sano  and
G. Marowsky
T. Schmidt-Uhlig*
Affiliation:
Laser Laboratorium Göttingen e.V., Hans-Adolf-Krebs-Weg 1, 37077 Göttingen, Germany
P. Karlitschek
Affiliation:
Laser Laboratorium Göttingen e.V., Hans-Adolf-Krebs-Weg 1, 37077 Göttingen, Germany
M. Yoda
Affiliation:
Nuclear Engineering Laboratory, Toshiba Corporation, 8, Shinsugita-cho, Isogo-ku, Yokohama 235-8523, Japan
Y. Sano
Affiliation:
Nuclear Engineering Laboratory, Toshiba Corporation, 8, Shinsugita-cho, Isogo-ku, Yokohama 235-8523, Japan
G. Marowsky
Affiliation:
Laser Laboratorium Göttingen e.V., Hans-Adolf-Krebs-Weg 1, 37077 Göttingen, Germany
*
tuhlig@llg.gwdg.de
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Abstract

A large-core multi mode optical fiber is used to deliver 100 mJ, 5 ns laser pulses produced by a frequency-doubled Nd:YAG laser over a distance of several meters. No damage is observed neither inside the fiber nor at its surface. The transmitted pulses are focused to a diameter of 700 μm onto a water-immersed type 304 stainless steel sample for laser shock processing. With a pulse density of 10000 pulses/cm2, a compressive residual surface stress is achieved. The affected depth is almost 900 μm, the maximum compressive stress −700 MPa.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 9 , Issue 3 , March 2000 , pp. 235 - 238
Copyright
© EDP Sciences, 2000

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