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Optical quality of a combined aerodynamic window

: Franek, J.; Zefferer, H.; Du, K.

Orza, J.M. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
8th International Symposium on Gas Flow and Chemical Lasers 1990
Bellingham/Wash.: SPIE, 1991 (SPIE Proceedings Series 1397)
ISBN: 0-8194-0480-2
International Symposium on Gas Flow and Chemical Lasers <8, 1990, Madrid>
Fraunhofer ILT ()
aerodynamic window; beam quality; degradation; distortion; divergence; expansion window; oblique shock; optical quality; Schlieren method; unstable resonator

The novel aerodynamic window with a pump cavity and a supersonic gas jet described in /1/ shows considerable improvements in operation performances such as shock-free operation range, reduction of the mass flow rate as well as operation stability. Its optical quality at different operation states has been investigated firstly with the schlieren method. Then the window was combined with a 5 kW CO2 laser using an unstable resonator. The influences of the window on the laser beam quality at different operation states have been investigated. The results will be presented in this paper.