Journal
VACUUM
Volume 80, Issue 11-12, Pages 1346-1350Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2006.01.016
Keywords
femtosecond laser; laser ablation; periodic microstructures; periodic nanostructures; titanium
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The periodic microstructures on titanium plate were formed by the irradiation of the ferntosecond laser with the laser wavelength of 800nm and the pulse length of 100 fs. They were oriented to the direction parallel to the laser polarization vector and their (parallel periodic microstructures) period was 1.5-2.4 mu m. The periodic nanostructures were also produced by the ferntosecond laser ablation, which were oriented to the direction perpendicular to the laser polarization vector and whose period was about 700 nm. Our results indicated that the laser fluence required for the parallel periodic microstructures was higher than that for the periodic nanostructures. The parallel periodic microstructures and the periodic nanostructures might be formed by an intensity modulation, which arose from the interaction of the laser and its scattered wave with a surface wave. The number of laser pulses to irradiate Ti plate was increased from 10 to 110. From 50 pulses, microdots were generated on the hills of the parallel periodic micro structures. From 70 pulses, the parallel periodic microstructures were varied to those with spatial modulation on the hills and the period of them was increased due to the bonding of the hills. (c) 2006 Elsevier Ltd. All rights reserved.
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