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Proceedings Paper

Laser modification of iron under atmospheric conditions: a study on target surface composition and laser-induced plasma
Author(s): Volkmar Nejedl; Thomas Witke; Andreas Lenk; Michael Panzner; Stefan Baunack; Klaus Wetzig
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Paper Abstract

Pure iron samples were irradiated with short single laser pulses (6 ns) under atmospheric conditions. For the irradiation a Q-switched Nd:YAG laser (wavelength 1064 nm) was used. The second and third harmonics (532 nm and 355 nm) were used for investigations at different wavelengths. The composition and expansion of the laser induced plasma were investigated using Optical Emission Spectroscopy (OES) and a High Speed Framing Camera (HSFC), respectively. The composition and morphology of the target surfaces were investigated by means of Auger Electron Spectroscopy (AES) and Scanning Electron Microscopy (SEM). AES measurements indicate that the near surface region of all laser spots is enriched with nitrogen (about 15 at-%) and covered by a thin oxidized layer. This surface composition was found to be similar for all wavelengths. It was established that the density (1019. . . 1023 cm-3), the composition (Fe+, N+ and O+), the temperature (30,000. . . 35,000 K) and the expansion of the laser induced plasma are similar for all wavelengths as well. Because of the high density the plasma absorbs the laser irradiation completely and the wavelength becomes less important for the laser target interaction. We assume that the cooling process leads to a formation of compounds of iron and nitrogen which are deposited on the surface.

Paper Details

Date Published: 14 September 1998
PDF: 11 pages
Proc. SPIE 3343, High-Power Laser Ablation, (14 September 1998); doi: 10.1117/12.321580
Show Author Affiliations
Volkmar Nejedl, Institut fuer Festkoerper- und Werkstofforschung (Germany)
Thomas Witke, Fraunhofer-Institut fuer Werkstoff- und Strahltechnik (Germany)
Andreas Lenk, Fraunhofer-Institut fuer Werkstoff- und Strahltechnik (Germany)
Michael Panzner, Fraunhofer-Institut fuer Werkstoff- und Strahltechnik (Germany)
Stefan Baunack, Institut fuer Festkoerper- und Werkstofforschung (Germany)
Klaus Wetzig, Institut fuer Festkoerper- und Werkstofforschung (Germany)


Published in SPIE Proceedings Vol. 3343:
High-Power Laser Ablation
Claude R. Phipps, Editor(s)

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