Jena 2013 – wissenschaftliches Programm
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K: Fachverband Kurzzeitphysik
K 7: Laseranwendungen und Lasermaterialbearbeitung I
K 7.1: Fachvortrag
Donnerstag, 28. Februar 2013, 11:15–11:45, HS 4
Influence of sample temperature on the expansion dynamics and the optical emission of laser-induced plasma — Simon Eschlböck-Fuchs1, Michael Haslinger1, Andreas Hinterreiter1, Philipp Kolmhofer1, Norbert Huber1, Roman Rössler2, Johannes Heitz1, and •Johannes Pedarnig1 — 1Christian Doppler Laboratory Laser-Assisted Diagnostics, Institute of Applied Physics, Johannes Kepler University, A-4040 Linz, Austria — 2voestalpine Stahl GmbH, A-4031 Linz, Austria
We investigate the influence of sample temperature on the dynamics and optical emission of laser induced plasma for various solid materials. Aluminium, silicon, and slag samples are heated to temperature Ts = 500 °C and ablated in air by Nd:YAG laser pulses. The plasma dynamics is investigated by fast time-resolved photography. For laser-induced breakdown spectroscopy (LIBS) the optical emission of plasma is measured by Echelle spectrometers and intensified CCD cameras. For all sample materials the temporal evolution of plume size and broadband plasma emission vary systematically with Ts. The size and brightness of expanding plumes increase at higher Ts while the mean intensity remains independent of temperature. The intensity of emission lines increases with temperature for all samples. Plasma temperature and electron number density do not vary with Ts. We apply the calibration-free LIBS method to determine the concentration of major oxides in slag and find good agreement to reference data up to Ts = 450 °C. The LIBS analysis of multi-component materials at high temperature is of interest for technical applications.