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A novel master oscillator/power amplifier architecture for optical parametric conversion of high pulse energy from 1.064μm to 1.572μm in KTiOPO4 crystalis presented.A high gain of more than 80 at 1.572μm pumped by a high energy Q-switched pulse laser is realized.With a seeding signal energy of 1 m J,and 400mJ pump pulse at 100 Hz,an amplified signal pulse energy of over 80mJ is obtained.The total optical-optical conversion efficiency reaches 21%.