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, A.A.BörzsönyiEidam, T.T.EidamLimpert, J.J.Limpert2022-05-062022-05-062021https://publica.fraunhofer.de/handle/publica/41695610.1109/CLEO/Europe-EQEC52157.2021.95421312-s2.0-851204371392-s2.0-85117621966Few-cycle laser systems providing both high repetition rates and high pulse energies are a major focus of next-generation light sources. Consequently, the research facility of the Extreme Light Infrastructure (ELI) that is devoted to the generation of isolated attoseconds pulses, (ELI-ALPS in Szeged, Hungary), has set the demand for a laser system delivering carrier-envelope phase (CEP) stable pulses with 5 mJ of pulse energy, 6 fs pulse duration at 100 kHz repetition rate, which corresponds to an average power of 500 W [1]. This laser system, that is named HR2 (the high-repetition-rate beam line), is currently under development at Active Fiber System GmbH. Achieving these ambitious laser parameters is done by merging the robust techniques of coherent combination as an average-power scaling concept and the use of stretched hollow-core fiber technology for nonlinear pulse compression [2].en620conference paper