二维LiNbO_3非线性光子晶体

Two-dimensional periodically poled LiNbO_3 nonlinear photonic crystal

制备了周期为 13 6 4 μm方形格子二维周期性极化的LiNbO3,利用二阶准相位匹配实现了波长为 1 0 6 4 μm二倍频 ,二次谐波的内部转换效率高达 4 2 % .测量了二次谐波输出功率随晶体温度及入射光入射方向的变化 ,实验值与模拟计算一致 .制备二阶准相位匹配掩模板 ,解决了在制备一阶准相位匹配掩模板中遇到周期尺寸太小、数据量大的难题 ,同时还降低了因周期太小造成的极化难度 .

A two-dimensional periodically poled lithium niobate crystal with a 13.64 mum period was fabricated. The inverted duty cycle was about 23%. The second harmonic output for the second-order quasi-phase-matching (QPM) against the input was measured. The maximum second harmonic internal conversion efficiency was higher than 40%. All results implied that the second-order QPM could be used to obtain high-frequency conversion efficiency. Compared with the first-order QPM, the second-order QPM can reduce the requirement for the poling technique and the mask fabrication.