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Proceedings Paper

Beam generation and beam shaping for a 1.5-kW diffusion-cooled annular CO2 laser
Author(s): Uwe Habich; Arnd Heursch; Heinz-Dieter Plum; Reinhart Poprawe
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Paper Abstract

A diffusion-cooled CO2-laser with an output power of 1.5 kW was developed and set up with a coaxial RF-excited discharge. The laser beam is extracted by a resonator with helical mirrors, which is stable in the radial direction and unstable in the azimuthal direction. Without any beam transformation this laser emits a general astigmatic beam with an elliptical power density distribution, which is rotating in a plane perpendicular to the beam axis while propagating. Also, the beam shows hard edge diffraction effects due to the hybrid unstable/stable design of the resonator. In order to make the beam applicable to standard materials processing applications a beam shaping device has to be used to transform the general astigmatic beam into one of more rotational symmetry. The resulting beam has a times- diffraction-limited factor M2 equals 1.5.

Paper Details

Date Published: 13 May 1998
PDF: 8 pages
Proc. SPIE 3267, Laser Resonators, (13 May 1998); doi: 10.1117/12.308126
Show Author Affiliations
Uwe Habich, Fraunhofer-Institut fuer Lasertechnik (Germany)
Arnd Heursch, Fraunhofer-Institut fuer Lasertechnik (Germany)
Heinz-Dieter Plum, Fraunhofer-Institut fuer Lasertechnik (Germany)
Reinhart Poprawe, Fraunhofer-Institut fuer Lasertechnik (Germany)

Published in SPIE Proceedings Vol. 3267:
Laser Resonators
Alexis V. Kudryashov; Pierre Galarneau, Editor(s)

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