Gebhardt, M.M.GebhardtHeuermann, T.T.HeuermannGaida, C.C.GaidaWang, Z.Z.WangLenski, M.M.LenskiKlas, R.R.KlasKirsche, A.A.KirscheLiu, C.C.LiuHädrich, S.S.HädrichJauregui, C.C.JaureguiRothhardt, J.J.RothhardtLimpert, J.J.Limpert2022-03-152022-03-152020https://publica.fraunhofer.de/handle/publica/41215510.1364/ASSL.2020.AF3A.32-s2.0-85102553564We present HHG results obtained with thulium-doped fiber lasers. It is the first time that a photon energy cut-off close to 400 eV has been demonstrated using this highly scalable laser technology.en620conference paper