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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.