近非临界相位匹配温度调谐MgO:LiNbO_3OPO

Near Noncritically Phase-matched Temperature Tunable MgO:LiNbO_3 OPO

通过对 Mg O:L i Nb O3参量过程温度相位匹配及走离角、允许参量等运转参数的理论计算与分析 ,确定了晶体的切割角度 θ=82°,以近非临界相位匹配 (NCPM)取代 NCPM,将温度调节范围控制在较低的温度上 ,研制了 5 32 nm泵浦的 Mg O:L i Nb O3温度调谐脉冲光学参量振荡器 (OPO)。在 80 0～ 170 0nm波段实现连续调谐输出。参量泵浦功率密度阈值为 5 7.3MW/ cm2 ,泵浦能量约 2倍阈值处 ,单谐振(SRO)参量转换效率为 11%以上。

Based on the theoretically studies of the MgO:LiNbO 3 OPO type I temperature phase match and of several OPO operation parameters such as walkoff angle and acceptance parameters,the MgO:LiNbO 3 crystal cut angle is selected as θ=82°.Replacing NCPM with near NCPM to limigted the temperatuer range of runing to comparatively low level,a temperature tuned MgO:LiNbO 3 OPO pumped by 532 nm is developed and 800～1 700 nm tunable signal lights are achieved.The OPO threshold pump peak intensity is 57.3 MW/cm 2.On the position of two times of threshold energy,the SRO conversion efficiency is over 11 %.