有效倍频行为中相位匹配条件的适用范围  

The Limits of Applicability of Phase-matching Condition on the Effective Frequency Doubling Behavior

作　　者：赵珂[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所,合肥230031

出　　处：《量子电子学报》2001年第4期357-360,共4页Chinese Journal of Quantum Electronics

摘　　要：任何一种理论都有它的适用范围，相位匹配条件亦不例外．因此我们可以问是否存在一个判据，它告诉我们什么时候可以“相位匹配地”讨论有效倍频现象以及什么时候必须“非相位匹配地”讨论．本文基于晶体的离散原子结构状态讨论了有效倍频行为中先前Ｆｒａｎｋｅｎ和Ｗａｒｄ所描述的相位匹配条件的适用范围，粗略地说，每当所有有关的光波波长都比晶格中原子间距大得多时，“相位匹配地”讨论就足够了，也即是足够精确了．Any theory has its limits of applicability including the phase-matching condition. Then we may ask whether a criterion exists which tells us when the effective frequency doubling may be discussed 'phase-matchingly' and when it must be discussed ' non-phase-matchingly'. In this manuscript based on the actual discrete atomic structure of crystal, the limits of applicability of phase-matching condition described by Franken and Ward on the effective frequency doubling behavior are discussed. Roughly speaking a phase-matching treatment is adequate, i.e., sufficiently accurate, whenever all relevant optical wavelengths are large compared to the lattice constant of the crystal.

关 键 词：倍频 二次谐波 相位匹配条件 晶体 

分 类 号：O437.1[机械工程—光学工程]