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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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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 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
Authors:
AuthorsInstitution or Email of Authors
Pargmann, Carstencarsten.pargmann@dlr.de
Hall, Thomasthomas.hall@dlr.de
Date:2010
Status:Accepted
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 (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignement
DLR - Research theme (Project):L - Laser Research and Technology
Location: Lampoldshausen
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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