Wavelength influence on nitrogen insertion into titanium by nanosecond pulsed laser irradiation in air

► Nitrogen insertion into titanium by VIS and IR laser irradiation in air was studied. ► VIS lasers (532nm) showed a lower efficiency for nitrogen insertion than IR lasers. ► Threshold conditions (irradiance vs. number of shots) for N insertion were found. ► Oxygen was also found in the surface laye...

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Bibliographic Details
Published in:Applied surface science 2013-08, Vol.278, p.245-249
Main Authors: Torrent, F., Lavisse, L., Berger, P., Jouvard, J.-M., Andrzejewski, H., Pillon, G., Bourgeois, S., Marco de Lucas, M.C.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Engineering Sciences
Exact sciences and technology
Laser nitriding
Light elements insertion
NRA
Physics
Raman spectroscopy
Surface functionalization
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Summary:► Nitrogen insertion into titanium by VIS and IR laser irradiation in air was studied. ► VIS lasers (532nm) showed a lower efficiency for nitrogen insertion than IR lasers. ► Threshold conditions (irradiance vs. number of shots) for N insertion were found. ► Oxygen was also found in the surface layers with a shorter insertion depth than nitrogen. We studied in this work the influence of the wavelength (532 vs. 1064nm) on the insertion of nitrogen in titanium targets by surface laser treatments in air. The laser pulses were of 5ns and the irradiance was lower than 25×1012W/m2. Results obtained using a frequency-doubled Nd:YAG laser at 532nm were compared with those previously reported for laser treatments at 1064nm. Nuclear reaction analysis and micro-Raman spectroscopy were used for determining the composition and the structure of the surface layers, respectively. Results showed the lower efficiency of irradiation at 532nm for nitrogen insertion, which is possible only above threshold conditions depending on both the laser irradiance and the number of cumulated impacts per point. This was explained as being due to a higher ablative effect in the visible range. The insertion of oxygen giving rise to the growth of titanium oxynitrides was also discussed.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2012.11.110