自散焦晶体中空间二次谐波的产生机理  

On Spacial Second-harmonic Generating Mechanism in Self-defocus Photorefractive Crystal

作　　者：王龙飞[1] 杨立森[1] 武一洁[1] 李永辉[1] 逯文婷[1] 

机构地区：[1]内蒙古师范大学物理与电子信息学院,内蒙古呼和浩特010022

出　　处：《河北师范大学学报（自然科学版）》2014年第1期36-41,共6页Journal of Hebei Normal University：Natural Science

基　　金：国家自然科学基金(60467002);内蒙古自治区自然科学基金(2013MS0926)

摘　　要：在掺Fe浓度为0.025%,厚度为1.06mm的自散焦LiNbO3∶Fe晶体中发现了阵列光束与写入晶格相互作用,表现为双光束、3光束、4光束和6光束全部发生光斑分裂.通过对一维和二维光子晶体的二次谐波现象的理论计算,证明了空间二次谐波是产生光斑分裂的原因,并且发现满足相位匹配条件能够提高二次谐波的产生效率.The LiNbO3：Fe is a self-defocus crystal in which the concentration of Fe is 0.025% and its thickness is 1.06 mm. The phenomenon of array beam interacting with photonic lattices fabricated was spotted in LiNbO3 ：Fe photonic crystal. Light spot division was observed in Dual,three, four and six-beams of light. The light spot division is due to the spatial second-harmonic proved by the theoretical calculation of the second-harmonic. As for the second-harmonic generation, we show that the efficiency of the second- harmonic generation can be greatly enhanced if the phase match condition is met.

关 键 词：自散焦晶体 光斑分裂 二次谐波 相位匹配 

分 类 号：O437[机械工程—光学工程]