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Comparison of welding results with stable and unstable resonators

: Franke, J.; Pflüger, S.; Du, K.; Imhoff, R.

Orza, J.M. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
8th International Symposium on Gas Flow and Chemical Lasers 1990
Bellingham/Wash.: SPIE, 1991 (SPIE Proceedings Series 1397)
ISBN: 0-8194-0480-2
International Symposium on Gas Flow and Chemical Lasers <8, 1990, Madrid>
Fraunhofer ILT ()
beam quality; performance; stable and unstable resonator; welding

In order to compare welding performance of stable and unstable resonators an industrial axial-flow-CO2-laser in the 5 kW range has been operated with two stable and one unstable resonator at 5 kW. Along with a beam diagnostic analysis of the beam quality benchmark welding tests have been carried out. The results show, that for stable resonators the beam quality is a measure of the welding performance. However the unstable resonator shows considerable higher welding depth as predicted by beam quality dependency found for stable resonators.