Rothhardt, J.J.RothhardtHädrich, S.S.HädrichDemmler, S.S.DemmlerTschernajew, M.M.TschernajewKlas, R.R.KlasLimpert, J.J.LimpertTünnermann, A.A.Tünnermann2022-03-132022-03-132016https://publica.fraunhofer.de/handle/publica/40083510.1364/HILAS.2016.HM6B.52-s2.0-85019507273Efficient HHG with a frequency-doubled fiber laser yields 970 mW in a single narrowband harmonic at 21.6 eV. In argon the energy bandwidth of H11 at 26.6 eV is DE/E=2*10-3 due to a window- resonance.en620conference paper