Erlangen 2022 – wissenschaftliches Programm

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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 6: Laser-Beam Matter Interaction - Laser Applications I

K 6.6: Vortrag

Donnerstag, 17. März 2022, 12:00–12:15, K-H4

Optical emission spectroscopy of laser-induced plasmas for rapid in-situ multi-element analysis of materials - basic physical processes and novel industrial applications — •Reinhard Noll — Fraunhofer-Institut für Lasertechnik, Steinbachstr. 15, 52074 Aachen

For nanosecond laser pulses (>10^9 W/cm2) focused at solid/liquid targets each material undergoes a rapid phase transition leading to a transient micro-plasma. The constituting species achieve significant population densities at excitation levels of up to 10 eV and more. During relaxation these species emit element specific optical radiation from deep UV to near IR. Tailored laser pulse bursts allow to penetrate non-representative surface layers and to generate optimized plasma states in terms of their optical emission features for spectro-chemical multi-element analysis (LIBS) [1].

Due to contactless excitation and measuring frequencies of 10 Hz to 1 kHz this method is predestinated for in-situ multi-element analyses in processing and producing fields of industry. An overview of novel applications of LIBS will be given ranging from metal producing industry to the fast identification of valuable materials for recycling processes. The worldwide first inverse production line will be presented to process printed circuit boards of end-of-life servers and cell phones for automized identification, extraction and sorting of valuable components based on laser 3D-measurements, LIBS, laser desoldering and cutting [2]. [1] C. Meinhardt et al, 2021, DOI: 10.1039/D0JA00445F; [2] R. Noll et al, doi.org/10.1016/j.sab.2021.106213