Gebhardt, M.M.GebhardtGaida, C.C.GaidaHeuermann, T.T.HeuermannJauregui, C.C.JaureguiAntonio-Lopez, J.J.Antonio-LopezSchulzgen, A.A.SchulzgenAmezcua-Correa, R.R.Amezcua-CorreaRothhardt, J.J.RothhardtLimpert, J.J.Limpert2022-03-142022-03-142019https://publica.fraunhofer.de/handle/publica/40621210.1117/12.2509650We report on the generation of 102 mJ-, sub-2 cycle pulses with several GW of peak power centered at 1.73 mm wavelength. The intense few-cycle source features 8.8 fs pulse duration (full-width at half maximum, FWHM). It is operated at 196 kHz pulse repetition rate and provides a record average power of 20 W. This result is enabled by the combination of two average power scalable concepts: direct emission from an ultrafast Tm-doped fiber laser system and nonlinear pulse compression in a gas-filled antiresonant hollow-core fiber. Ultrafast Tm-doped fiber lasers are scalable to kW-level average power, which emphasizes the great potential of this approach for driving high cut-off HHG at high repetition rates.en620conference paper