Riedel, R.R.RiedelStephanides, A.A.StephanidesPrandolini, M.J.M.J.PrandoliniGronloh, B.B.GronlohJungbluth, B.B.JungbluthMans, T.T.MansTavella, F.F.Tavella2022-03-042022-03-042014https://publica.fraunhofer.de/handle/publica/23586410.1364/OL.39.0014222-s2.0-84897423273Optical parametric chirped-pulse amplifiers with high average power are possible with novel high-power Yb:YAG amplifiers with kW-level output powers. We demonstrate a compact wavelength-tunable sub-30-fs amplifier with 11.4 W average power with 20.7% pump-to-signal conversion efficiency. For parametric amplification, a beta-barium borate crystal is pumped by a 140 W, 1 ps Yb: YAG InnoSlab amplifier at 3.25 MHz repetition rate. The broadband seed is generated via supercontinuum generation in a YAG crystal.en535journal article