1.112μm laser transition of Nd∶YAG was obtained by restrained the stronger stimulated laser transitions through cavity coating design. A LD pumped, LBO intracavity frequency doubled and Cr∶YAG passively Q-switched laser at 556 nm were reported.At the incident pump power of 1.6 W, the laser produced pulses of 48 ns duration at 556 nm, with a repetition rate of 8.9 kHz,meanwhile the average output power was 51 mW and the highest yellow peak power was about 119 W.