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Proceedings Paper

Stable-unstable resonators for annular gain media
Author(s): Dietmar Ehrlichmann; Uwe Habich; Heinz-Dieter Plum; Peter Loosen
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Paper Abstract

Annular gain media offer various advantages to the design of lasers. The advantages comprise efficient laser excitation by internal pumping sources for solid state lasers and large discharge surfaces for diffusion-cooling of high power CO2-lasers. To benefit from these advantages it is necessary to find a suitable resonator. The presented solution to the resonator problem consists of a hybrid resonator which is stable in radial and unstable in azimuthal direction. Basically, it can be considered as the annular equivalent of the well-known stable-unstable slab resonator. A geometrical model of the resonator indicates that for proper resonator function the mirror shapes must respect certain constraints. A diffraction model of the loaded resonator gives detailed information on the beam properties and extraction efficiencies. To reduce the computational effort for beam propagation an approximate diffraction kernel for annular beams has been used. Experimental data on a 1 kW diffusion-cooled CO2-laser are reported.

Paper Details

Date Published: 16 August 1994
PDF: 11 pages
Proc. SPIE 2206, High-Power Gas and Solid State Lasers, (16 August 1994); doi: 10.1117/12.184626
Show Author Affiliations
Dietmar Ehrlichmann, Fraunhofer-Institut fuer Lasertechnik (Germany)
Uwe Habich, Fraunhofer-Institut fuer Lasertechnik (Germany)
Heinz-Dieter Plum, Fraunhofer-Institut fuer Lasertechnik (Germany)
Peter Loosen, Fraunhofer-Institut fuer Lasertechnik (Germany)


Published in SPIE Proceedings Vol. 2206:
High-Power Gas and Solid State Lasers
Markus Bohrer; Tommaso Letardi; Dieter Schuoecker; Horst Weber, Editor(s)

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