全固态复合内腔和频570nm连续波黄光激光器

研制了全固态连续波570nm黄光激光器,黄激光分别由两片Nd:YAG的1444nm和946nm谱线非线性和频产生,两条谱线分别对应各自的晶体能级跃迁4F3/2-4I15/2和4F3/2-4I9/2。实验采用复合腔结构,利用KTP晶体II类临界相位进行内腔和频。测量了570nm黄激光输出功率随泵浦功率的变化,结果表明,当注入到两片Nd:YAG晶体的泵浦功率分别为24W和15W时,获得了560mW的连续波570nm黄激光输出,其4h功率稳定度优于±2.8%。在输出功率为560mW时,采用光束质量分析仪测量了激光输出光斑质量,结果显示,在570nm最大和频激光输出时的光束质量因子M2为2.3。所提出的复合内腔和频技术可为新波长激光器的发展提供参考。

All-solid-state continuous-wave doubly resonant all-intracavity sum-frequency yellow laser at 570 nm

An all solid-state continuous-wave yellow laser at 570 nm is firstly reported. The yellow laser is from two Nd∶YAG spectral lines of 1 444 nm and 946 nm with a nonlinear sum frequency,and the two spectral lines correspond to their energy levels of crystal transition for 4F3/2-4I15/2 and 4F3/2-4I9/2, respectively. By using a doubly folded-cavity, the yellow laser at 570 nm is obtained by a intra-cavity sum frequency mixing of type-II critical phase matching KTP crystal at 1 444 nm and 946 nm.The outpower of yellow laser vs incident pump powers is measured,results indicate that when pump powers injected into two Nd∶YAG crystals are 24 W and 15 W, respectively, the 570 nm yellow laser of 560 mW can be obtained,and its power stability in 4 h is better than ±2.8%. Furthermore,the beam quality of the yellow laser is measured by a beam quality analyzer in an output power of 560 mW, and results show its beam quality factor M2 is 2.3 in the laser with a maximum sum-frequency output.