Abstract
Optical quality of a free-vortex type aerodynamic laser window was directly measured with a Michelson Interferometer. Although it was spatially and/or temporally degraded by the fluid-dynamical effects, the temporal fluctuation level was 4kHz at worst. The transversely averaged density and the turbulence of the jet were gradually increased along the flow direction. By heating the working gas up to 450K, the density gradient was moderated down to 2/3.
