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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 (2007) COIL emission of a modified negative branch confocal unstable resonator. Applied Optics, 46 (31), pp. 7751-7756.

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Abstract

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.

Item URL in elib:https://elib.dlr.de/51679/
Document Type:Article
Title:COIL emission of a modified negative branch confocal unstable resonator
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Pargmann, CarstenUNSPECIFIEDUNSPECIFIED
Hall, ThomasUNSPECIFIEDUNSPECIFIED
Duschek, FrankUNSPECIFIEDUNSPECIFIED
Grünewald, Karin M.UNSPECIFIEDUNSPECIFIED
Handke, JürgenUNSPECIFIEDUNSPECIFIED
Date:2007
Journal or Publication Title:Applied Optics
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:46
Page Range:pp. 7751-7756
Editors:
EditorsEmail
Optical Society of America, UNSPECIFIED
Series Name:Applied Optics
Status:Accepted
Keywords:COIL, unstable resonator
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Laser Research and Technology (old)
Location: Lampoldshausen , Stuttgart
Institutes and Institutions:Institute of Technical Physics
Deposited By: Duschek, Dr.rer.nat. Frank
Deposited On:12 Nov 2007
Last Modified:31 Jul 2019 19:21

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