Laser material processing can be influenced by plasma formation and dynamics such as plasma shielding or plasma supported ablation. A novel method for investigating in-situ plasma and shock-wave dynamics inside a confined space like a laser drilled hole in metals is presented. A specific sample preparation with prepared mock-up holes including a transparent material as a window is used. By use of high speed imaging and spectroscopy a time and spatially resolved monitoring of the optical emissions of plasma and shock-waves is realized during drilling stainless steel and aluminum with ns-pulsed laser radiation. Spatial intensity distributions and velocities of the shock-waves and the plasma are measured inside the holes with a temporal resolution of 1 ns and a spatial resolution of less than 1 µm. The results are compared with models for shock-wave and plasma propagation in non-confined environments. Emission spectroscopy is carried out during the expansion of the plasma inside the drilled hole allowing the determination of electron density by Stark broadening.
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ICALEO 2008: 27th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing
October 20–23, 2008
Temecula, California, USA
ISBN:
978-0-912035-12-3
PROCEEDINGS PAPER
Measurement of plasma and shock-wave dynamics and properties inside holes during laser drilling of metals
Mihael Brajdic;
Mihael Brajdic
Lehrstuhl fuer Lasertechnik, RWTH Aachen University Steinbachstrasse
15, 52074 Aachen, Germany
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Martin Hermans;
Martin Hermans
Lehrstuhl fuer Lasertechnik, RWTH Aachen University Steinbachstrasse
15, 52074 Aachen, Germany
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Michel Kaminsky;
Michel Kaminsky
Lehrstuhl fuer Lasertechnik, RWTH Aachen University Steinbachstrasse
15, 52074 Aachen, Germany
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Ingomar Kelbassa
Ingomar Kelbassa
Lehrstuhl fuer Lasertechnik, RWTH Aachen University Steinbachstrasse
15, 52074 Aachen, Germany
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Published Online:
October 01 2008
Citation
Mihael Brajdic, Martin Hermans, Michel Kaminsky, Ingomar Kelbassa; October 20–23, 2008. "Measurement of plasma and shock-wave dynamics and properties inside holes during laser drilling of metals." Proceedings of the ICALEO 2008: 27th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. ICALEO 2008: 27th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Temecula, California, USA. (pp. M107). ASME. https://doi.org/10.2351/1.5061350
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