从理论和数值模拟上分析了一种一维短程有序双周期铁电畴结构中宽带级联三次谐波的产生过程.这种短程有序结构是由一系列一定长度的双周期极化铁电畴结构和任意长度的单畴结构交替构成.研究了结构参数对级联三次谐波产生过程中频谱带宽和转换效率的影响.结果表明,通过控制双周期极化结构段的长度可以实现级联频率转换过程中带宽的调节,而级联三次谐波的转换效率可以通过增加谐波和晶体的作用长度来实现.
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