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

Carsten Pargmann; Thomas Hall; Frank Duschek; Karin M. Grünewald; Jürgen Handke

doi:10.1117/12.880946

15 November 2010 Off-axis negative-branch unstable resonator with rectangular cross-section

Carsten Pargmann, Thomas Hall, Frank Duschek, Karin M. Grünewald, Jürgen Handke

Proceedings Volume 7751, XVIII International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; 775115 (2010) https://doi.org/10.1117/12.880946
Event: 18th International Symposium on Gas Flow and Chemical Lasers and High Power Lasers, 2010, Sofia, Bulgaria

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.

Citation Download 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 (15 November 2010); https://doi.org/10.1117/12.880946

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KEYWORDS

Resonators

Mirrors

Spherical lenses

Chemical oxygen iodine lasers

Diffraction

Near field

Infrared cameras

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