基于惠更斯-菲涅耳原理的Wave-front工程结构中的非线性光学相互作用
Wave-front engineering by Huygens-Fresnel principle for nonlinear optical interactions in domain engineered structures
摘要：
讨论了非线性光学相互作用的波前工程。利用惠更斯-菲涅耳原理，我们发展了一个域工程的一般理论和技术，而常规的准相位匹配结构是其特例。通过傅立叶分析，提出了局部准相位匹配的概念，指出准相位匹配只在局部实现，而不是全局实现。二次谐波聚焦效应的实验结果与理论预测吻合较好。该方案综合了二次谐波的产生、聚焦和分束三种光学功能，使器件结构更加紧凑。该方案可用于非线性光子学中多功能光学特性的集成，并可扩展非线性光学器件的应用。
英文摘要：
The wave-front engineering for nonlinear optical interactions was discussed. Using Huygens-Fresnel principle we developed a general theory and technique for domain engineering with conventional quasi-phase-matching structures being the special cases. By Fourier analysis we put forward the concept of local quasi-phase matching, which suggests that the quasi-phase matching is fulfilled only locally not globally. Experiments on focal effect of second-harmonic wave agreed well with the theoretical prediction. The proposed scheme combines three optical functions: generation, focusing and beam splitting of second-harmonic wave, thus making the device more compact. Further the proposed scheme can be used to perform the integration of multi-functional optical properties in nonlinear photonics, as well as expand the use of nonlinear optical devices.
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