1. 毕业设计（论文）的内容和要求
频率转换是最有价值的非线性光学效应之一，而有效的非线性光学过程通常需要一定的相位匹配条件.有许多基于光波导结构实现非线性频率转换的工作，如利用两个波导的耦合来实现二次谐波输出；也有将波导结构与超晶格结构相结合，在波导中刻入超晶格结构，利用波导耦合满足倍频相位匹配，利用超晶格满足和频过程相位匹配，同时满足多个过程的相位匹配条件，从而实现更多过程的参量转换。
可实现的转换过程越多，相应的结构就越复杂。
当两个平行的平板波导之间距离足够小，光在传输过程中能够进入对方导模消逝场所在的区域时，两个波导之间的模式就会发生相互耦合，这种在相邻的两个波导导模间发生的能量交换被称作定向耦合。
2. 参考文献
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