Power-scaling a Kerr-lens mode-locked Yb:YAG thin-disk oscillator via enlarging the cavity mode in the Kerr-medium

We report on a purely hard-aperture Kerr-lens mode-locked Yb:YAG thin-disk oscillator delivering 230-W, 11.5-μJ, 330-fs (30 MW) in air. To our knowledge this is the highest average power achieved from KLM oscillators so far.