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Proceedings Paper

Hybrid resonator configurations for COIL
Author(s): Frank Duschek; Jürgen Handke; Thomas Hall; Karin M. Grünewald
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Paper Abstract

Various schemes of geometrical coupling between optical resonator and gain medium were investigated for a 10-kW class Chemical Oxygen-Iodine Laser (COIL). Starting from theory, different types of resonator layouts were designed and optimized for COIL with a rectangular gain medium and an output coupling of about 10%. Hybrid resonators match these coupling conditions more easily than concentric unstable resonators. Compared to the negative branch type, the positive branch hybrid resonator shows very high sensitivity to the optical alignment in the unstable direction but avoids a focal line within the resonator. The obtained output power of both hybrid resonators is compared to the output power of the COIL device in a conventional stable resonator configuration. Measured margins for the sensitivity of resonator setup and alignment were found in close agreement with numerical calculations. Power density distributions were measured in the near field and in the far field. The divergence of the emitted laser beam in the unstable direction was nearly diffraction limited.

Paper Details

Date Published: 7 June 2006
PDF: 5 pages
Proc. SPIE 6261, High-Power Laser Ablation VI, 62612G (7 June 2006); doi: 10.1117/12.669205
Show Author Affiliations
Frank Duschek, Institute of Technical Physics, DLR (Germany)
Jürgen Handke, Institute of Technical Physics, DLR (Germany)
Thomas Hall, Institute of Technical Physics, DLR (Germany)
Karin M. Grünewald, Institute of Technical Physics, DLR (Germany)

Published in SPIE Proceedings Vol. 6261:
High-Power Laser Ablation VI
Claude R. Phipps, Editor(s)

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