充分利用全固态激光器结构紧凑的优点，设计了一套紧凑型直腔式457 nm蓝光激光器系统。在设计过程中，针对Nd:YVO4激光晶体的自身性质及其产生914 nm激光的相关光学特性，着重对该激光系统的激光阈值进行分析，对温控系统及谐振腔参数进行优化。最终实现了Nd:YVO4激光晶体914 nm波长激光运转，并在此基础上利用BIBO晶体进行腔内倍频获得457 nm激光输出。入射抽运光功率为24.2 W时，最高输出功率为1.56 W，光光转换效率为6.45%，功率稳定度低于2.98%，M2因子为1.3。

In order to give full play to the advantages of compact all-solid-state lasers, a compact straight cavity 457 nm blue laser system is designed. Based on the nature of the Nd:YVO4, the analysis of laser threshold of quasi-three-level laser system and the parameters optimization of resonator cavity are obtained. The laser of Nd:YVO4 operation at 914 nm and its 457 nm second harmonic is realized by intracavity frequency doubling with BIBO nonlinear crystal. The highest output power at 457 nm reaches 1.56 W with an incident pump power of 24.2 W, and the optical-to-optical conversion efficiency is higher than 6.45%, also the fluctuation of the blue output power is less than 2.98% and M2 factor is 1.3.