LBO倍频1.8 W连续671 nm红光激光器

Nd：YVO4晶体中掺杂的Nd^3 除了1．064μm的受激辐射跃迁外，还可产生1．342μm波段的弱辐射，经腔内倍频，最终可输出671nm的红色激光。报道了一种光纤耦合半导体激光二极管(LD)阵列端面抽运Nd：YVO4晶体，腔内采用Ⅰ类临界相位匹配LBO(LiB3O5)晶体倍频，实现波长为671nm的全固态红光激光器瓦级输出的理论分析和实验结果。采用短三镜折叠腔结构，通过对激光晶体热透镜焦距的估算，用计算机优化设计选取了合适的谐振腔参数，在芯径为400μm的光纤耦合808nm半导体激光二极管阵列抽运下，当注入功率为8W时，获得了波长为671nm的红光基模稳定输出．最高输出功率达1．8W，光-光转换效率达22．5％。

LBO Frequency Doubled CW Red Laser at 671 nm up to 1.8 W

The Nd3+ ion doped in Nd∶YVO4 crystal has a weak laser transition at 1.342 μm in addition to 1.064 μm stimulated transition. The laser at 1.342 μm can be frequency doubled to obtain red light at 671 nm. In this paper, the analysis and the experiment of a Nd∶YVO4 crystal pumped by 400 μm fiber coupled diode array, type Ⅰ critical phase matching and intra cavity frequency doubled LBO (LiB3O5) crystal, and red laser at output wavelength of 671 nm were performed. By using a short folded cavity resonator, the thermal focal length of Nd∶YVO4 crystal was calculated, and the parameters of laser cavity were selected by computer optimum design. At last, with incident pump power of 8 W, TEM00 mode (transverse electromagnetic mode) red laser at 671 nm of 1.8 W was obtained, with the optical conversion efficiency up to 22.5%.