We present a semiconductor saturable absorber mirror mode-locked thin disk laser based on Yb:Lu2O3 with an average power of 141W and an optical-to-optical efficiency of more than 40%. The ideal soliton pulses have an FWHM duration of 738fs, an energy of 2.4μJ, and a corresponding peak power of 2.8MW. The repetition rate was 60MHz and the beam was close to the diffraction limit with a measured M2 below 1.2.