准周期铁电晶体中不同阶次的准相位匹配谐频  

Different-Order Quasi-Phase Matching Harmonics in Quasiperiodic Ferroelectric Crystals

作　　者：马博琴[1] 马冬莉[2] 李志远[2] 张道中[2] 

机构地区：[1]中国传媒大学理学院,北京100024 [2]中国科学院物理研究所,北京100080

出　　处：《光学学报》2009年第12期3473-3476,共4页Acta Optica Sinica

基　　金：中国传媒大学理科规划项目(NG0805);中国传媒大学"382人才工程"资助课题

摘　　要：采用外加高压电场极化的方法,制备了二维八重准周期结构的铌酸锂非线性光子晶体。沿该晶体倒空间的基矢方向上实现了两种波长的有效共线倍频输出,在偏离该方向22.5°的方向上,获得了另外三种波长的倍频输出。同时,在入射光束对称两侧观察到了不同种波长的非共线倍频光斑。利用二维八重准周期铁电晶体,在约480 nm的入射波长范围内实现了近20种波长的共线及非共线准相位匹配倍频过程,两邻近的基频波长间隔最小可达3 nm。当晶体旋转45°的整数倍时,可以得到相同的结果。The LiNbO3 nonlinear photonic crystal with two-dimensional octagonal quasilattice was fabricated by applying external electric field. Along the direction of the basic reciprocal vectors, the effective collinear quasi-phase matching （QPM） second-harmonics （SH） of two wavelengths were realized, and along the direction diverging 22.5° from the former direction, so were three other wavelengths. Simultaneously, the non-collinear QPM SH at two symmetric angles with respect to the input wavelength were observed. The collinear and non-collinear QPM harmonics of about twenty wavelengths were obtained in the range of 480 nm, in which the minimum interval of two adjacent fundamental wavelengths was only 3 nm. The same results could also be obtained by rotating the crystal by 45°.

关 键 词：非线性光学 非线性光子晶体 准周期极化铌酸锂 准相位匹配谐波 

分 类 号：O437[机械工程—光学工程]