Run-away electron preionized diffuse discharge as a source of efficient laser emission in the IR, UV, VUV

Abstract

REP DD was suggested as an excitation source of various gas lasers. The efficient lasing was obtained in the IR, UV, and VUV spectral ranges. The ultimate intrinsic efficiency of non-chain chemical lasers on HF(DF) molecules was achieved. REP DD pumped N2 laser with an ultimate electrical efficiency of 0.2% was developed. Lasing on N2 molecules with 2 or 3 peaks in successive REP DD current oscillations was obtained for the first time. The laser action on F2* at 157 nm and rare gas fluorides (KrF*, XeF*) under REP DD pumping was obtained for the first time, as well. It has been shown that the volume stage of REP DD in mixtures with fluorine can last over 50 ns during several current half-cycles. Therewith, the efficiency and the pulse duration of lasers on rare gas fluorides and VUV F2* laser parameters under REP DD excitation are comparable with those obtained in suitable transverse discharges. The results allow the conclusion that the REP DD homogeneity in mixtures with F2 and SF6 is high enough for attaining high laser efficiency.