Any theory has its limits of applicability including the phase - matching condition.
任何一种理论都有它的适用范围,相位匹配条件亦不例外.
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At first, the theory of nonlinear frequency conversion and quasi - phase matching is briefly introduced.
首先, 在原理部分,吾人简略的介绍了非线性频率转换,与准相位匹配的原理.
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