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Proceedings Article

Off-axis negative-branch unstable resonator with rectangular cross-section

[+] Author Affiliations
Carsten Pargmann, Thomas Hall, Frank Duschek, Karin M. Grünewald, Jürgen Handke

Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)

Proc. SPIE 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 775115 (November 15, 2010); doi:10.1117/12.880946
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From Conference Volume 7751

  • XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
  • Sofia, Bulgaria | August 30, 2010

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.

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Citation

Carsten Pargmann ; Thomas Hall ; Frank Duschek ; Karin M. Grünewald and Jürgen Handke
"Off-axis negative-branch unstable resonator with rectangular cross-section", Proc. SPIE 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 775115 (November 15, 2010); doi:10.1117/12.880946; http://dx.doi.org/10.1117/12.880946


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