Wedemonstrateahigh-contrast,joule-levelNd:glasslasersystemoperatingat0.5Hzrepetitionratebasedonadoublechirpedpulseamplification（CPA）scheme.Byinjectinghigh-contrast,high-energyseedpulsesintotheNd:glassCPAstage,thepulseenergyisamplifiedto1.9JthroughtwoopticalparametricCPAstagesandtwoNd:glassamplifiers.Thetemporalcontrastofcompressedpulseismeasureddowntothelevelof10-8attensofps,and10-10near200psbeforethemainpulse,respectively.
