An optimized designed CW 914nm laser at room temperature is obtained.Using typeI criticalmatching BIBO crystal,457nm blue laser is obtained by 914nm intracavity frequency doubling.The maximum laser output power of 48mW is obtained when a incident pump laser of 1.4W is used.The opticaltooptical conversion up to 3.4%,the power instability in 24h is better than±2.8%.