利用声光调Q Nd:YVO4激光器输出的1064 nm激光抽运周期极化掺氧化镁LiNbO3(PPMgLN)晶体,实现了角度调谐的双信号光运转准相位匹配(QPM)光参量输出。PPMgLN晶体长50 mm,具有周期相位反转结构,极化周期29.6 μm,相位反转周期6.808 mm,利用外加电场极化法制作,极化沿晶体的z向进行。在晶体外部旋转角度为0°-8°范围内,实现了双信号光波在1474.8-1479 nm和1489.5-1495.2 nm波段的快速调谐输出。对角度调谐准相位匹配进行了相应的理论分析,理论结果与实验值较为一致。

Angle-tuned dual signal quasi-phase-matched (QPM) optical parametric generator (OPG) based on periodically poled MgO-doped lithium niobate (PPMgLN) pumped by an acousto-optically Q-switched Nd∶YVO4 laser is reported. The PPMgLN crystal is 50 mm long and has a periodical phase reversed grating structure. The grating period is 29.6 μm and the phase reversed period is 6.808 mm. The crystal is periodically poled along the z-axis by using the external electric poling technique. While the crystal is rotated over the range of 0°-8°,the dual signal wavelengths can be rapidly tuned from 1474.8 to 1479 nm and 1489.5 to 1495.2 nm. The theoretical analysis for angle-tuned dual signal OPG is also presented. The calculated results show good agreement with the experimental data.