紧凑型激光二极管抽运全固态355nm连续波紫外激光器

Compact laser diode end-pumped Nd:YAG intracavity frequency-tripled quasi-continuous 355 nm laser

报道了一台激光二极管端面抽运Nd:YVO4晶体内腔三倍频355nm激光连续输出的全固态紫外激光器.激光腔采用紧凑型简单凹平直腔,腔长仅为70mm.利用两块LBO晶体进行腔内倍频、和频,当注入抽运功率为25.27W时,获得最大功率为30.6mW的355nm连续波输出,光光转换效率为0.12%,输出功率短期不稳定性为5.3%,355nm激光输出光束质量良好.通过采用内腔倍频技术和设计合理的腔参数,实现了中小功率连续输出的全固态紫外激光器的小型化、便携化,进一步拓宽了紫外激光器的应用领域.

A diode-end-pumped Nd：YVO4 intracavity frequency-tripled continuous-wave 355 nm laser has been demonstrated.The laser cavity is the simple concave-to-plane linear cavity,which is short and compact.The laser cavity length is only 70 mm.The efficient second and third-harmonic waves are generated by two lithium triborate（LBO）crystals successfully.The 355 nm laser output power is 30.6 mW at a pump power of 25.27 W with an optical-to-optical efficiency of 0.12% and the corresponding beam quality is satisfactory. The instability of the output power of 27.4 mW is less than 5.3 %. By using the technology of intracavity frequency conversion and choosing the proper parameters in cavity design, the miniaturization and handiness of the all- solid-state continuous-wave ultraviolet lasers with the relatively low output powers are improved greatly, which will broaden the application fields of the ultraviolet lasers.