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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 31 — Nov. 1, 2007
  • pp: 7751–7756

COIL emission of a modified negative branch confocal unstable resonator

Carsten Pargmann, Thomas Hall, Frank Duschek, Karin Maria Grünewald, and Jürgen Handke  »View Author Affiliations


Applied Optics, Vol. 46, Issue 31, pp. 7751-7756 (2007)
http://dx.doi.org/10.1364/AO.46.007751


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Abstract

A modified negative branch confocal unstable resonator (MNBUR) was coupled to the chemical oxygen-iodine laser (COIL) device of the German Aerospace Center. It consists of two spherical mirrors and a rectangular scraper for power extraction. Experimentally measured distributions of the near- and far-field intensities and the near-field phase were found in close agreement to numerical calculations. The extracted power came up to 90 % of the power as expected for a stable resonator coupled to the same volume of the active medium. The output power revealed a considerable insensitivity towards tilts of the resonator mirrors and the ideal arrangement of the scraper was found to be straightforward by monitoring the near-field distributions of intensity and phase. The beam quality achieved with the MNBUR of an extremely low magnification of only 1.04 was rather poor but nevertheless in accordance with theory. The demonstrated consistency between theory and experiment makes the MNBUR an attractive candidate for lasers that allow for higher magnification. In particular, it promises high brilliance in application to 100   kW class COIL devices, superior to the conventional negative branch confocal unstable resonator.

© 2007 Optical Society of America

OCIS Codes
(140.1550) Lasers and laser optics : Chemical lasers
(140.3410) Lasers and laser optics : Laser resonators
(140.4780) Lasers and laser optics : Optical resonators
(230.5750) Optical devices : Resonators

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: August 20, 2007
Revised Manuscript: September 18, 2007
Manuscript Accepted: September 21, 2007
Published: October 29, 2007

Citation
Carsten Pargmann, Thomas Hall, Frank Duschek, Karin Maria Grünewald, and Jürgen Handke, "COIL emission of a modified negative branch confocal unstable resonator," Appl. Opt. 46, 7751-7756 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-31-7751

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