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Proceedings Paper

Experimental Investigations With The Prototype Of A Free-Vortex Aerodynamic Window
Author(s): E. Wildermuth; W. Schock; A. Giesen; H. Hugel
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Paper Abstract

The development of CO2-lasers tends to high power devices with an average power of ten kilowatt and more. In the same way as laser power is raised, the thermal load on the output coupling window increases. So it is necessary to investigate either materials for high power solid state windows or gasdynamic windows as we did. Preliminary investigations with a supersonic free-vortex aerodynamic window proved both, a good optical quality and fluid-mechanical sealing of a simulated laser cavity. Basing upon these results an experimental prototype was designed. To minimize the flow rate needed for the maintaining of the sealing gas jet, the aperture area is chosen very small, 5mm x 5mm. The outcoupled laser beam is focused through this opening by means of two asphere mirrors. The sealing properties and optical quality were demonstrated by operating the prototype mounted at a 5 kW CO2-laser. One particularity is the active controlling of the gas flow in the aerodynamic widow by adjusting part of the diffuser. So it is possible to vary the achievable cavity pressure and to adapt it to the actual pressure level in the laser.

Paper Details

Date Published: 20 June 1989
PDF: 4 pages
Proc. SPIE 1031, 7th Intl Symp on Gas Flow and Chemical Lasers, (20 June 1989); doi: 10.1117/12.950566
Show Author Affiliations
E. Wildermuth, DFVLR, Institut fur Technische Physik (FRG)
W. Schock, DFVLR, Institut fur Technische Physik (FRG)
A. Giesen, Universitat Stuttgart (FRG)
H. Hugel, Universitat Stuttgart (FRG)

Published in SPIE Proceedings Vol. 1031:
7th Intl Symp on Gas Flow and Chemical Lasers
Dieter Schuoecker, Editor(s)

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