Excimer lasers with supersonic gas flow

The data obtained at the Institut de Mecanique des Fluides de Marseille with U.V. and visible high energy laser with supersonic gas flow and excitation by electron beam are presented. The positive effects of an important temperature decrease on the characteristics of some U.V. and visible light high energy lasers with high performances (excimer, etc...) and on the fluorescence efficiency of some molecular emissions are described. Moreover the effects of a supersonic flow on the optical properties of the active medium in quasi continuous regime (high average power lasers) are discussed