A laser diode (LD)-pumped Nd:YAG double-disk laser with an average output power of more than 1.5 kW is reported in this paper. A nearly flat top pump profile is achieved with a good design for the four-pass optical coupling system. The disk is coated with Ti, Pt and Au at the back side of the disk which is high-reflectively (HR) coated for the wavelength of the pump and laser radiation, then is welded to the Cu-micro-channel cooler by indium-welding technology. An average output power of 1.52 kW is obtained from two disks with a diameter of 40 mm and a thickness of 1.3 mm. The pumping peak power on each disk is 17.7 kW with duty cycle of 10%. The optical efficiency of the laser system is about 43% and the electrical to optical efficiency is more than 20%.