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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.
| Item URL in elib: | https://elib.dlr.de/64596/ | |||||||||
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| Document Type: | Conference or Workshop Item (Speech) | |||||||||
| Title: | Off-axis negative-branch unstable resonator with rectangular cross-section | |||||||||
| Authors: |
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| Date: | 2010 | |||||||||
| Open Access: | No | |||||||||
| Gold Open Access: | No | |||||||||
| In SCOPUS: | No | |||||||||
| In ISI Web of Science: | No | |||||||||
| 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 assignment | |||||||||
| DLR - Research theme (Project): | L - Laser Research and Technology (old) | |||||||||
| Location: | Lampoldshausen | |||||||||
| Institutes and Institutions: | Institute of Technical Physics | |||||||||
| Deposited By: | Pargmann, Dr. Carsten | |||||||||
| Deposited On: | 12 Jul 2010 10:54 | |||||||||
| Last Modified: | 12 Jul 2010 10:54 |
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