A high peak power Nd:YAG laser system with moderate repetition rate is demonstrated.The laser system contains three main components,the all-fiber-based seed,LD-pumped Nd:YAG regenerative amplifier and flashlamp-pumped two-pass Nd:YAG amplifier.The average power is 12 W,the repetition rate is 10 Hz,the single pulse energy of the laser system is up to 1.2J,and the pulse width is 3ns.With the wavelength of 1064 nm,the diameter of the output beam is 10 mm.More than 95% pulse energy is focused in the range of 60...