Klenke, A.A.KlenkeMüller, M.M.MüllerStark, H.H.StarkStutzki, F.F.StutzkiHupel, C.C.HupelSchreiber, T.T.SchreiberTünnermann, A.A.TünnermannLimpert, J.J.Limpert2022-03-142022-03-142019https://publica.fraunhofer.de/handle/publica/40608510.1117/12.2509428We present a laser amplifier based on coherent combination of 16 channels from a single multicore fiber employing multi-channel components for beam splitting, combination and temporal phasing. Stretched femtosecond pulses (250 fs transform-limit) were combined with an efficiency of 80% at up to 205 W average power.en620conference paper