Control of the surface plasma during pulsed laser cutting

Ulrich Bielesch; M. Napp; Johannes Heinrich Schaefer; Juergen Uhlenbusch

doi:10.1117/12.270150

4 April 1997 Control of the surface plasma during pulsed laser cutting

Ulrich Bielesch, M. Napp, Johannes Heinrich Schaefer, Juergen Uhlenbusch

Proceedings Volume 3092, XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference; (1997) https://doi.org/10.1117/12.270150
Event: XI International Symposium on Gas Flow and Chemical Lasers and High Power Laser Conference, 1996, Edinburgh, United Kingdom

Abstract

During pulsed laser cutting of aluminum with a repetitively pulsed carbon-dioxide laser a strong correlation between quality of the cut judged by the burr height and electron density of the laser induced plasma on the surface and in the kerf occurs. The electron density is supervised by an absorption experiment and can be adjusted by the pulse duration. A feedback loop based on a comparison between the actual absorption signal and an absorption set point on the one hand and a variation of the laser pulse duration on the other hand is developed to provide an in situ control of the quality of the cut. The system works suitable for different sheet thicknesses and for outlined cuts. The results of optimized cuts are introduced.

Citation Download Citation

Ulrich Bielesch, M. Napp, Johannes Heinrich Schaefer, and Juergen Uhlenbusch "Control of the surface plasma during pulsed laser cutting", Proc. SPIE 3092, XI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (4 April 1997); https://doi.org/10.1117/12.270150

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