High-peak-power pulses from a cavity-dumped Yb:KY(WO_4)_2 oscillator

We report generation of $1.35\mu \mathrm{J}$ femtosecond laser pulses with a peak power of $3\mathrm{MW}$ at $1\mathrm{MHz}$ repetition rate from a diode-pumped $\mathrm{Yb}:\mathrm{K}\mathrm{Y}{\left(\mathrm{W}{\mathrm{O}}_4\right)}_2$ laser oscillator with cavity dumping. By extracavity compression with a large-mode-area fiber and a prism sequence, we generate ultrashort pulses with a duration of $21\mathrm{fs}$ and a peak power of $13\mathrm{MW}$.