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We have demonstrated a high power diode-pumped mode-locked femtosecond Yb∶KGW laser with semiconductor saturable absorber mirror (SESAM).By using an output coupler with 10% transmittance,the laser delivered 160-fs pulses with average output power of 7.6 W at a repetition rate of 78 MHz,corresponding to pulse energy of 97 nJ and peak power of 606 kW.