Jena 2013 – wissenschaftliches Programm
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K: Fachverband Kurzzeitphysik
K 7: Laseranwendungen und Lasermaterialbearbeitung I
K 7.2: Vortrag
Donnerstag, 28. Februar 2013, 11:45–12:00, HS 4
Laser induced breakdown spectroscopy signal enhancement for atomic chlorine with a second orthogonal laser pulse — •Michael Haslinger1, Philipp Kolmhofer1, Andreas Hinterreiter1, Simon Eschlböck-Fuchs1, Josef Hofstadler1, Norbert Huber1, Hermann Wolfmeir2, 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
Laser Induced Breakdown Spectroscopy (LIBS) is an upcoming diagnostics method that enables to analyse almost all chemical elements. A strong improvement of sensitivity for the detection of trace elements by excitation with a second laser pulse is reported in literature. The aim of our work is to analyze iron oxide materials by LIBS and to search for possible enhancement of chlorine signals by double-pulse excitation. A 1064 nm laser pulse was used to ablate a pressed FeO sample and induce plasma, and an orthogonal second laser pulse was used to excite this plasma. The wavelength of the second laser was either 1064 nm or 193 nm. We measured the plasma properties for different laser wavelengths and inter pulse delay times. The plasma emission was monitored by optical spectroscopy from 200 nm to 850 nm. Our results show enhanced double-pulse LIBS signals for Cl under optimized conditions.