报道了一台全固态连续波500.8 nm青光激光器。实验中采用复合式谐振腔结构, 用两个激光二极管阵列(LDA)经过光纤耦合分别单独端面抽运两块Nd∶YAG晶体, 青色激光由两块Nd∶YAG晶体的1064 nm和946 nm谱线非线性和频产生。在两个子谐振腔的交叠区域利用LBO Ⅰ类临界相位匹配进行腔内和频, 通过谐振腔优化设计, 实现了腔内两个波长较好的模式与增益匹配。当注入到两块Nd∶YAG晶体的抽运功率分别为12 W和8 W时, 获得223 mW的TEM00模连续波500.8 nm青色激光输出, 水平和垂直方向的光束质量M2因子约为1.2。实验结果表明, 采用复合式腔结构和频是获取高功率500.8 nm青色激光输出的有效方法。

An all solid-state continuous-wave cyan laser at 500.8 nm is presented. By using a new resonator for doubly resonant, two Nd∶YAG are pumped by two laser diode arrays (LDA) coupled by optical fibers, respectively. In the two cavities, wavelengths of 1064 nm from one Nd∶YAG and 946 nm from the other are chosen to be mixed into 500.8-nm cyan laser. Through proper design of the cavity, the optimum matching of modes and gains for the two wavelengths can be obtained. In the overlapping of the cavities, sum-frequency mixing is generated with a type I critical phase matching LBO crystal. The cyan laser output of 223 mW at 500.8 nm with TEM00 mode is obtained at the incident pump power of 12 W for one Nd∶YAG crystal and 8 W for the other. The beam quality M2 value is about 1.2 in both horizontal and vertical directions at the maximum output power. The experimental results show that the intracavity sum-frequency mixing by doubly resonant is an effective method for high power 500.8-nm cyan laser.