报道了激光二极管列阵(LDA)端面抽运全固体腔内倍频大功率蓝光激光技术的研究。采用复合Nd:YAG晶体作为增益介质,并利用半导体致冷器(TEC)对激光晶体的温度进行精密控制。倍频晶体采用Ⅰ类临界相位匹配方式切割的LBO晶体。谐振腔为V型结构。根据大功率抽运条件下激光晶体热透镜效应严重,且热透镜的焦距会随着抽运功率的增大逐渐变短的特点,计算出最大抽运功率条件下激光晶体的热透镜焦距,依据此数据来优化谐振腔结构,使激光器实现最佳模式匹配和倍频效率,得到高效蓝光激光输出。在可吸收抽运功率为18.5 W时,473 nm蓝光激光输出功率为1.38 W,抽运光-倍频光的光-光转换效率为7.5%。

The laser diode array (LDA) end-pumped intracavity doubling frequency high power blue laser is reported. Gain medium is composited Nd:YAG crystal, the temperature of which is precisely controlled by thermoelectrically cooled (TEC). The doubling frequency crystal used in the experiment is a LBO (LiB2O3) crystal cut in phase-matching type Ⅰ. The cavity is V type. This cavity is designed based on the facts that the thermal-lensing effect of the rod pumped by high pumped power is serious and the focal length of the thermal lens becomes shorter when the pumped power increases. According to the highest pumped power, the cavity is optimized so that the optimum mode-matched and high conversion efficiency are realized. When absorbed pumped power is 18.5 W, the blue laser output power at 473 nm is 1.38 W and the conversion efficiency of pumped light to doubling frequency light is 7.5%. The laser is simple and stable in structure.