8 May 2007 LIBS micro-analysis of solid aluminum samples by use of optical fibers as light guide
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Proceedings Volume 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; 634626 (2007) https://doi.org/10.1117/12.738886
Event: XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 2006, Gmunden, Austria
Abstract
Solid Al alloy samples were analyzed by laser-induced breakdown spectroscopy (LIBS) either by employing an optical glass fiber as light waveguide or by direct laser irradiation in air. The samples had an Al content of 87.56 % to 99.2 % (w/w), a Si content of 0.07 % to 11.12 %, a Fe content of 0.15 % to 0.89 % and a Mg content of 0.005 % to 2.38 %. For the LIBS analyses, we used an Nd:YAG laser delivering 5 to 7 ns pulses with pulse energies from 50 to 500 mJ per pulse at a repetition rate of 10 or 20 Hz. The experiments were performed either at a wavelength of 1064 nm or (frequency doubled) at 532 nm. We obtained qualitatively similar results in experiments with direct laser irradiation in air and experiments where cleaved fibers were used as a laser light guide. Damage of the fibers sets an upper limit for the laser energy in the latter case. Experiments employing tapered fibers showed that a lateral resolution in the order of 10 &mgr;m is feasible with the presented setup.
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T. Stehrer, J. Heitz, "LIBS micro-analysis of solid aluminum samples by use of optical fibers as light guide", Proc. SPIE 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 634626 (8 May 2007); doi: 10.1117/12.738886; https://doi.org/10.1117/12.738886
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