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Proceedings Paper

Off-axis negative-branch unstable resonator with rectangular cross-section
Author(s): Carsten Pargmann; Thomas Hall; Frank Duschek; Karin M. Grünewald; Jürgen Handke
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Paper Abstract

For laser media with large cross-section and low small signal gain neither the stable nor the unstable conventional resonator is an applicable choice. Either the large Fresnel number leads to a multimode operation or the low output coupling ring results in large diffraction effects and therefore in a heavily structured far field. In order to reduce these diffraction effects a modified negative-branch unstable resonator (MNBUR) was introduced. In rotational symmetry the off-axis setup provides an output coupling in the shape of a half ring and is accomplished with the help of a scraper. The shape of this scraper can also be modified to adapt the MNBUR to a rectangular symmetry, whereas the spherical resonator mirrors are kept unchanged. The scraper either takes the shape of a rectangular bracket "[" or of the letter "L". The performance of both scrapers is tested using a chemical oxygen iodine laser (COIL) of the 10 kW class. The results are compared to numerical calculations.

Paper Details

Date Published: 16 November 2010
PDF: 6 pages
Proc. SPIE 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 775115 (16 November 2010); doi: 10.1117/12.880946
Show Author Affiliations
Carsten Pargmann, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Thomas Hall, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Frank Duschek, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Karin M. Grünewald, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Jürgen Handke, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)


Published in SPIE Proceedings Vol. 7751:
XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers

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