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本文在简介了 ＦＣ（ｎ）和按 ＦＣ（ｎ）序列排列的 ＬｉＮｂＯ３超晶格系统的结构特征之后，解析地推导了在小信号、平面波近似条件下，按 ＦＣ（ｎ）序列排列的 ＬｉＮｂＯ３超晶格系统二次谐波光的输出功率和转化效率公式，得出了 ＬｉＮｂＯ３晶体材料的上述系统寻常光的二次谐波输出光每单位面积的输出功率 Ｓ（２ω）对于基频光波长的关系，发现对于 ＬｉＮｂＯ３晶体材料而言，一定的铁电畴序列系统存在相应稳定调谐的寻常倍频光输出功率，在红外光区域存在四条转换效率很大的调谐谱线；非寻常倍频光也具有相似的结论，但调谐谱线的波长向可见光区域发生偏移而且转化效率较高的谱线有六条．另外，还讨论了上述铁电畴系统的二次谐波输出光谱线的两种有趣的缺级效应．
After introducing the structural features of the LiNbO3 superlattice system arranged by FC (n) and FC (n) sequences, the paper deduces the LiNbO3 superlattices arrayed by FC (n) in small signal and plane wave approximation. The output power and conversion efficiency of the second harmonic light of the lattice system are obtained, and the output power S (2ω) per unit area of the second harmonic output light of the ordinary system light of the LiNbO3 crystal material is obtained. For the fundamental frequency light wavelength It is found that for a LiNbO3 crystal, a certain ferroelectric domain sequence system has the corresponding steady harmonic frequency doubling light output power, and there are four tuning spectrum lines with high conversion efficiency in the infrared region. The extraordinary frequency doubling light It has similar conclusion, but there are six lines for tuning the wavelength of the spectral lines to the visible region and high conversion efficiency. In addition, two interesting missing effects of the second harmonic output spectral lines of ferroelectric domains are also discussed.