COIL emission of a modified negative branch confocal unstable resonator
Pargmann, Carsten and Hall, Thomas and Duschek, Frank and Grünewald, Karin M. and Handke, Jürgen
COIL emission of a modified negative branch confocal unstable resonator.
Applied Optics, 46 (31), pp. 7751-7756.
A modified negative branch confocal unstable resonator (MNBUR) was coupled to the chemical oxygeniodine laser (COIL) device of the German Aerospace Center. It consists of two spherical mirrors and a rectangular scraper for power extraction. Experimentally measured distriutions of the near- and farfield 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.
|Title:||COIL emission of a modified negative branch confocal unstable resonator|
|Authors||Institution or Email of Authors|
|Grünewald, Karin M.||UNSPECIFIED|
|Journal or Publication Title:||Applied Optics|
|Page Range:||pp. 7751-7756|
|Optical Society of America, ||UNSPECIFIED|
|Series Name:||Applied Optics|
|Keywords:||COIL, unstable resonator|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||Aircraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L AR - Aircraft Research|
|DLR - Research theme (Project):||L - Laser Research and Technology|
|Institutes and Institutions:||Institute of Technical Physics|
Dr.rer.nat. Frank Duschek
|Deposited On:||12 Nov 2007|
|Last Modified:||12 Dec 2013 20:28|
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