Gaida, C.C.GaidaHeuermann, T.T.HeuermannGebhardt, M.M.GebhardtShestaev, E.E.ShestaevButler, T.P.T.P.ButlerGerz, D.D.GerzLilienfein, N.N.LilienfeinSulzer, P.P.SulzerFischer, M.M.FischerHolzwarth, R.R.HolzwarthLeitenstorfer, A.A.LeitenstorferPupeza, I.I.PupezaLimpert, J.J.Limpert2022-03-062022-03-062018https://publica.fraunhofer.de/handle/publica/25863010.1364/OL.43.005178We report on the generation of a high-power frequency comb in the 2 mm wavelength regime featuring high amplitude and phase stability with unprecedented laser parameters, combining 60 W of average power with <30  fs pulse duration. The key components of the system are a mode-locked Er:fiber laser, a coherence-preserving nonlinear broadening stage, and a high-power Tm-doped fiber chirped-pulse amplifier with subsequent nonlinear self-compression of the pulses. Phase locking of the system resulted in a phase noise of less than 320 mrad measured within the 10 Hz-30 MHz band and 30 mrad in the band from 10 Hz to 1 MHz.en620High-power frequency comb at 2 µm wavelength emitted by a Tm-doped fiber laser systemjournal article