https://doi.org/10.1051/epjap:2000109
Laser shock processing with 20 MW laser pulses delivered by optical fibers
1
Laser Laboratorium Göttingen e.V., Hans-Adolf-Krebs-Weg 1, 37077 Göttingen, Germany
2
Nuclear Engineering Laboratory, Toshiba Corporation, 8, Shinsugita-cho, Isogo-ku, Yokohama 235-8523,
Japan
Corresponding author: tuhlig@llg.gwdg.de
Received:
26
October
1999
Revised:
14
January
2000
Accepted:
24
January
2000
Published online: 15 March 2000
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.
PACS: 42.81.Cn – Fiber testing and measurement of fiber parameters / 42.62.Cf – Industrial applications / 62.50.+p – High-pressure and shock-wave effects in solids and liquids
© EDP Sciences, 2000
