We report a 2mu m ultrafast solid-state Tm:Lu2O3 laser, mode-locked by single-layer graphene, generating transform-limited~410fs pulses, with a spectral width~11.1nm at 2067nm. The maximum average output power is 270mW, at a pulse repetition frequenc
y of 110MHz. This is a convenient high-power transform-limited laser at 2mu m for various applications, such as laser surgery and material processing.
