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We demonstrate a diode-pumped cw mode-locked Nd:YAG by an acousto-optic mode locker.A mode-locked pulse with duration of 345 ps and output power of 12 W is obtained.The resonator design shows three advantages:a larger mode volume,high stability against thermal lens fluctuations,and excellent beam quality with TE00 mode.Different from previous active mode locking designs,we employ a frequency stabilizer and a phase-lock loop circuit to ensure the mode locking stable operation.