Growth of large microcones in steel under multipulsed Nd:YAG laser irradiation |
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| Authors: | SI Dolgaev JM Fernández-Pradas JL Morenza P Serra GA Shafeev |
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| Institution: | (1) Department of Applied Physics and Optics, University of Barcelona, Av. Diagonal 647, 08028 Barcelona, Spain;(2) Wave Research Centre, A.M. Prokhorov General Physics Institute, 38 Vavilov st., 119991 Moscow, Russia |
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| Abstract: | We report the growth of conical microstructure arrays on a stainless steel substrate under multi-pulsed Nd:YAG laser irradiation
(wavelength of 1.064 μm, pulse duration of 300 ns, repetition rate of 5 kHz) at atmospheric air pressure. The average period
of microcones is 70 μm, and they protrude 50–60 μm above the substrate. At an air pressure of 1 Pa, the well-defined conical
shape is lost and the resulting microstructure shows a smaller period and height. At 10-3 Pa, only small protrusions separated by about 5 μm are observed. The different mechanisms involved in the growth of conical
microstructures are discussed.
PACS 42.62.-b; 81.65.-b |
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