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We report what is believed to be the first demonstration of the laser action of Yb3+-doped Gd2SiO5 (Yb:GSO)crystal pumped by a 940-nm laser diode at room temperature. The threshold of laser generation is only 0.85 kW/cm2, which is smaller than the theoretic threshold of Yb:YAG (1.54 kW/cm2). The laser wavelength is 1090 nm. With a 2.5% output coupler, the maximum output power is 415 mW under a pump power of 5W. By using the SESAM, the Q-switched modelocking and CW mode-locked operations are demonstrated.