
Proceedings Paper
Off-axis negative-branch unstable resonator with rectangular cross-sectionFormat | Member Price | Non-Member Price |
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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: 15 November 2010
PDF: 6 pages
Proc. SPIE 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 775115 (15 November 2010); doi: 10.1117/12.880946
Published in SPIE Proceedings Vol. 7751:
XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
Tanja Dreischuh; Petar A. Atanasov; Nikola V. Sabotinov, Editor(s)
PDF: 6 pages
Proc. SPIE 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 775115 (15 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)
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)
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
Tanja Dreischuh; Petar A. Atanasov; Nikola V. Sabotinov, Editor(s)
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