SUPERSONIC FLOW LOW TEMPERATURE ELECTRONIC TRANSITION EXCIMER LASERS
Résumé
High power pulsed ultraviolet excimer laser emissions have been achieved with the high density and very low temperature supersonic flow-electron beam excitation and supersonic flow - electron beam stabilized discharge excitation devices developped at I.M.F.M. (ρ ⩽ 2 amagats, T ≃ 70 -150 K). Experimental results are given for effects of strong cooling and very high speed and high density flow on lasing characteristics of several U.V. and visible laser systems (XeF*, XeCl*, Ne+ F*). Effects of strong cooling on other excimer systems and noticeally strong enhancement of fluorescence efficiency for several trimers (Kr2F*, Xe2Cl*, Kr2Cl*), very attractive as potential visible high efficiency lasers, are described. Experimental results on fluid dynamics of these supersonic flow U.V. and visible lasers, noticeally discharge stability, and flowing medium behavior following excitation, as recorded by interferometry, are presented. Possibilities of very high speed flow, high density systems are discussed with the aim to consider development of future high average power excimer lasers.
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