短程有序结构中宽带二次谐波产生的研究  

Study on Broadband Second Harmonic Generation in Short-Range Ordered Quadratic Medium

作　　者：王文杰[1] 牛晓颖[1] 周春花[1] 

机构地区：[1]太原理工大学物理与光电工程学院,太原030024

出　　处：《人工晶体学报》2014年第5期1252-1256,共5页Journal of Synthetic Crystals

基　　金：国家自然科学基金青年基金(11204206);山西省回国留学人员科研资助项目(2013-037)

摘　　要：本文从理论和数值模拟上分析了一种短程有序铁电畴结构中二次谐波的产生过程。这种短程有序结构是由一系列一定长度的周期极化铁电畴结构和任意长度的单畴结构交替构成。研究了结构参数对频率变化过程中频谱带宽和转换效率的影响。结果表明,转换效率可以通过增加短程有序结构的晶体长度得到提高,而频谱带宽的大小可以通过调节周期极化结构的长度加以控制。The second harmonic generation in the short-ranged ordered ferroelectric domain structure was theoretically and numerically studied. The structure is composed with an alternative change of periodic poled ferroelectric segments of certain length and random extended single domains. The effect of structure parameters on the acceptance bandwidth and conversion efficiency of the frequency conversion process were investigated. The results show that the conversion efficiency of the process can be enhanced by using a longer locally-ordered medium, while the acceptance bandwidth can be managed by the length of the periodic poled ferroelectric segment.

关 键 词：二次谐波产生 频率变化 准相位匹配 

分 类 号：O437[机械工程—光学工程]