Laser modification of iron under atmospheric conditions: a study on target surface composition and laser-induced plasma

Volkmar Nejedl; Thomas Witke; Andreas Lenk; Michael Panzner; Stefan Baunack; Klaus Wetzig

doi:10.1117/12.321580

14 September 1998 Laser modification of iron under atmospheric conditions: a study on target surface composition and laser-induced plasma

Volkmar Nejedl, Thomas Witke, Andreas Lenk, Michael Panzner, Stefan Baunack, Klaus Wetzig

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Proceedings Volume 3343, High-Power Laser Ablation; (1998) https://doi.org/10.1117/12.321580
Event: High-Power Laser Ablation, 1998, Santa Fe, NM, United States

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.

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Volkmar Nejedl, Thomas Witke, Andreas Lenk, Michael Panzner, Stefan Baunack, and Klaus Wetzig "Laser modification of iron under atmospheric conditions: a study on target surface composition and laser-induced plasma", Proc. SPIE 3343, High-Power Laser Ablation, (14 September 1998); https://doi.org/10.1117/12.321580

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KEYWORDS

Plasma

Iron

Atmospheric plasma

Nitrogen

Laser processing

Laser irradiation

Cameras

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