Hädrich, S.S.HädrichShestaev, E.E.ShestaevWalther, N.N.WaltherNagy, T.T.NagySimon, P.P.SimonBlumenstein, A.A.BlumensteinKlenke, A.A.KlenkeKlas, R.R.KlasBuldt, J.J.BuldtStark, H.H.StarkGebhardt, M.M.GebhardtBreitkopf, S.S.BreitkopfJojart, P.P.JojartSeres, I.I.SeresVarallyay, Z.Z.VarallyayBörzsönyi, Ã.Ã.BörzsönyiEidam, T.T.EidamLimpert, J.J.Limpert2022-03-152022-03-152020https://publica.fraunhofer.de/handle/publica/41215410.1364/ASSL.2020.AF1A.7Multi-mJ, 10fs pulses at average powers beyond 300W are generated by compression of of an Yb-fiber-CPA in a 6m long stretched capillary. CEP stabilization of the CPA system yields ~220mrad at 1.1kW of average power.en620conference paper