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In this paper, a Q-switched intracavity frequency doubling Cr: LiSAF laser is reported. The relation of laser output behaviors with input energy was studied experimentally. The second harmonic output energy of 15.6 mJ at 450.1 nm for pumping energy of 83 J, the second harmonic output energy of 16 mJ at 445.1 nm for pumping energy of 75 J, and a tunable range of 445.1 ～465.1 nm were obtained in experiments.