Mueller, M.M.MuellerKlenke, A.A.KlenkeStark, H.H.StarkBuldt, J.J.BuldtGottschall, T.T.GottschallLimpert, J.J.LimpertTünnermann, A.A.Tünnermann2022-03-132022-03-132017https://publica.fraunhofer.de/handle/publica/40111310.1364/ASSL.2017.AW4A.3We present a 16 channel coherently-combined ultrafast fiber delivering 1.83 kW average power, 2.3 mJ pulse energy and 234 fs pulse duration at a combining efficiency of 82%. Challenges and further scaling potential are discussed.en620conference paper