Cummins, T. (Thomas)T. (Thomas)CumminsOtsuka, TakamitsuTakamitsuOtsukaYugami, NoboruNoboruYugamiJiang, WeihuaWeihuaJiangEndo, AkiraAkiraEndoLi, BowenBowenLiO'Gorman, ColmColmO'GormanDunne, PadraigPadraigDunneSokell, EmmaEmmaSokellO'Sullivan, GerryGerryO'SullivanHigashiguchi, TakeshiTakeshiHigashiguchi2012-06-192012-06-192012 Ameri2012Applied Physics Letters0003-6951 (print)1077-3118 (online)http://hdl.handle.net/10197/3688We have demonstrated an efficient extreme ultraviolet (EUV) source at 6.7 nm by irradiating Gd targets with 0.8 and 1.06 μm laser pulses of 140 fs to 10 ns duration. Maximum conversion efficiency of 0.4% was observed within a 0.6% bandwidth. A Faraday cup observed ion yield and time of flight signals for ions from plasmas generated by each laser. Ion kinetic energy was lower for shorter pulse durations, which yielded higher electron temperatures required for efficient EUV emission, due to higher laser intensity. Picosecond laser pulses were found to be the best suited to 6.7 nm EUV source generation.229682 bytesapplication/pdfenThe following article appeared in Applied Physics Letters, 100, 061118 (2012) and may be found at http://dx.doi.org/10.1063/1.3684242. The article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.PlasmaGadoliniumPlasma kinetic theoryPlasma light propagationPlasma production by laserSpectroscopic light sourcesGadoliniumLaser plasmasJournal Article100610.1063/1.3684242https://creativecommons.org/licenses/by-nc-sa/1.0/