Off-axis negative-branch unstable resonator with rectangular cross-section
Pargmann, Carsten and Hall, Thomas (2010) Off-axis negative-branch unstable resonator with rectangular cross-section. XVIII International Symposium on Gas Flow and Chemical Lasers & High Power Lasers , 30. Aug. - 03. Sep. 2010, Sofia, Bulgarien.
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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 yields large diffraction effects and therefore 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.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||Off-axis negative-branch unstable resonator with rectangular cross-section|
|Keywords:||COIL, unstable resonator, high power laser|
|Event Title:||XVIII International Symposium on Gas Flow and Chemical Lasers & High Power Lasers|
|Event Location:||Sofia, Bulgarien|
|Event Type:||international Conference|
|Event Dates:||30. Aug. - 03. Sep. 2010|
|Organizer:||Bulgarian Academy of Sciences|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L - no assignement|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L - no assignement|
|DLR - Research theme (Project):||L - Laser Research and Technology|
|Institutes and Institutions:||Institute of Technical Physics|
|Deposited By:||Carsten Pargmann|
|Deposited On:||12 Jul 2010 10:54|
|Last Modified:||12 Jul 2010 10:54|
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