Theoretical investigations of efficient cascaded third-harmonic generation in quasi- phase-matched and -mismatched configurations
Theoretical investigations of efficient cascaded third-harmonic generation in quasi- phase-matched and -mismatched configurations
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准相位匹配和失配配置中高效级联三次谐波产生的理论研究
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
N. Ming
中科院分区：
文献类型：
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作者：
Yiqiang Qin;Yong‐yuan Zhu;Chao Zhang;N. Ming
研究了相位匹配和相位失配两种结构下二次谐波和三次谐波变换器的非线性耦合波方程的理论和数值解。对于相位失配的次谐波产生，考虑并分析了几种方案（单次谐波产生或和频产生的相位失配，以及单次谐波产生和频产生的相位失配）。本文讨论和研究了广义相位失配时的最佳TH变换特性。据发现，有效的TH产生不仅取决于耦合系数的大小，但也对它们的比率。在特定的比率下可以获得100%TH输出。讨论了不同耦合系数比的物理本质。
Theoretical and numerical solutions of the nonlinear coupling-wave equations of second-harmonic (SH) and third-harmonic (TH) converters are investigated for both phase-matched and phase-mismatched configurations. For phase-mismatched TH generation, several kinds of schemes [the phase mismatch in either SH generation or sum-frequency generation (SFG) as well as the phase mismatch in both SH generation and SFG] are considered and analyzed. The optimal TH converting properties for generalized phase-mismatching operation are discussed and studied. It is found that efficient TH generation depends not only on the magnitude of the coupling coefficients but also on their ratio. A 100% TH output can be obtained at a particular ratio. The physical nature of the different ratios of the coupling coefficients is discussed.