OSA's Digital Library

Applied Optics

Applied 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)

View Full Text Article

Enhanced HTML    Acrobat PDF (1334 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



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

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

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)

Sort:  Year  |  Journal  |  Reset  


  1. A. E. Siegman, "Unstable optical resonators for laser application," Proc. IEEE 53, 277-287 (1965). [CrossRef]
  2. A. E. Siegman, "Unstable optical resonators," Appl. Opt. 13, 353-367 (1974). [CrossRef] [PubMed]
  3. A. H. Paxton and W. P. Latham, Jr., "Unstable resonators with 90° beam rotation," Appl. Opt. 25, 2939-2946 (1986). [CrossRef] [PubMed]
  4. Y. Bin, B. Yang, F. Sang, D. Zhou, L. Dou, and Q. Zhuang, "Experimental investigations of an unstable ring resonator with 90-deg beam rotation for a chemical oxygen iodine laser," Appl. Opt. 38, 3249-3252 (1999). [CrossRef]
  5. O. L. Bourne and P. E. Dyer, "A novel stable-unstable resonator for beam control of rare-gas halide lasers," Opt. Commun. 31, 193-196 (1979). [CrossRef]
  6. N. Hodgson, T. Haase, and H. Weber, "Improved resonator design for rod lasers and slab lasers," Proc. SPIE 1277, 70-84 (1990). [CrossRef]
  7. K. Kuba, T. Yamamoto, and S. Yagi, "Improvement of slab-laser beam divergence by using an off-axis unstable-stable resonator," Opt. Lett. 15, 121-123 (1990). [CrossRef] [PubMed]
  8. T. Hall, "Numerical studies on hybrid resonators for a medium-sized chemical oxygen iodine laser," Opt. Eng. 44, 114201 (2005). [CrossRef]
  9. J. Handke, W. O. Schall, T. Hall, F. Duschek, and K. M. Grünewald, "Chemical oxygen-iodine laser power generation with an off-axis hybrid resonator," Appl. Opt. 45, 3831-3838 (2006). [CrossRef] [PubMed]
  10. T. Hall, F. Duschek, K. M. Grünewald, and J. Handke, "Modified negative branch confocal unstable resonator," Appl. Opt. 45, 8777-8780 (2006). [CrossRef] [PubMed]
  11. J. W. Goodman, Introduction to Fourier Optics (McGraw-Hill, 1968).
  12. K. M. Grünewald, J. Handke, and F. Duschek, "Small signal gain and temperature profiles in supersonic COIL," Proc. SPIE 4184, 75-78 (2000). [CrossRef]
  13. A. G. Fox and T. Li, "Resonant modes in a maser interferometer," Bell Syst. Tech. J. 40, 453-488 (1961).
  14. J. Hartmann, "Bemerkungen über den Bau und die Justirung von Spektrographen," Z. Instrum. 20, 2-27 (1900).
  15. R. V. Shack and B. C. Platt, "Production and use of a lenticular Hartmann screen," J. Opt. Soc. Am. 61, 656-660 (1971).
  16. J. Handke, K. M. Grünewald, and W. O. Schall, "Power extraction in investigations for a 10-kW-class supersonic COIL," Proc. SPIE 3574, 309-314 (1998). [CrossRef]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited