空间二次谐波产生对光子晶格结构的影响  

Influence of Special Second-Harmonic Generation on Photonic Lattice Structure

作　　者：王龙飞[1] 杨立森[1] 武一洁[1] 李强[1] 施慧渊[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：《激光与光电子学进展》2014年第7期120-125,共6页Laser & Optoelectronics Progress

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

摘　　要：利用傅里叶变换法在自散焦LiNbO3:Fe晶体中写入光子晶格的过程中发现,阵列光束与写入晶格相互作用产生的空间二次谐波对写入晶格的结构具有一定的影响。表现为光子晶格中空间频率的倍频现象,干涉条纹的分裂现象和布拉格带隙的展宽现象。通过对一维光子晶格中空间二次谐波的数值模拟和理论计算,证明了空间二次谐波的产生是晶格结构发生改变的主要原因。实验表明,通过控制空间二次谐波的产生情况可以有效地改变写入光子晶格的内部结构。Fourier transform is applied to write the lattice structure in self-defocusing LiNbO3：Fe crystal. In the process spacial second-harmonic generation is fabricated by array beam interacting with photonic lattice. The spacial second-harmonic generation has an influence on writing the lattice structure.Resulting in spacial frequency-doubling in photonic lattice, cleavage phenomenon of interference fringe in lattice, and Bragg bandgap broadening. The numerical simulations and theoretical calculations of one-dimensional photonic lattice prove that spacial secondharmonic generation is the major cause of affecting lattice structure. Experimental results show that spacial secondharmonic generationcan control the internal structure in photonic lattice.

关 键 词：非线性光学 光子晶格 傅里叶变换法 空间二次谐波 

分 类 号：O437[机械工程—光学工程]