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Proceedings Paper

Controlled CO2 laser cutting on the border to beginning of plasma
Author(s): Hans Kurt Toenshoff; Andreas Ostendorf; Bernd Thiessen
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Paper Abstract

The content of the presented work is an experimental investigation in the border range between inert gas melt cutting and the plasma generation point. Based on spectral emission measurements, a photo detector with a wavelength sensitivity of 400 - 800 nm was found to be suitable for detecting the development of plasma. The detector was positioned behind a coated ZnSe mirror to measure the process signal coaxially. Parameter investigations show the influence of the cutting gas pressure and feed rate on the ignition of plasma. By increasing the feed rate to the maximum cutting speed, the amplitude of sudden plasma sparking increases. To avoid this effect, a concept for a closed-loop control system in order to eliminate the plasma sparking is presented.

Paper Details

Date Published: 29 May 2001
PDF: 10 pages
Proc. SPIE 4276, Commercial and Biomedical Applications of Ultrashort Pulse Lasers; Laser Plasma Generation and Diagnostics, (29 May 2001); doi: 10.1117/12.428004
Show Author Affiliations
Hans Kurt Toenshoff, Laser Zentrum Hannover e.V. (Germany)
Andreas Ostendorf, Laser Zentrum Hannover e.V. (Germany)
Bernd Thiessen, Laser Zentrum Hannover e.V. (Germany)


Published in SPIE Proceedings Vol. 4276:
Commercial and Biomedical Applications of Ultrashort Pulse Lasers; Laser Plasma Generation and Diagnostics
Richard F. Haglund; Richard F. Haglund; Richard F. Wood; Joseph Neev; Richard F. Wood, Editor(s)

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