Guo Hongchen, Tang Sing Hai, Qin Yiqiang, Zhu Yong Yuan
Department of Physics, National University of Singapore, 117542, Singapore.
Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Jun;71(6 Pt 2):066615. doi: 10.1103/PhysRevE.71.066615. Epub 2005 Jun 29.
In conventional frequency conversion based on chi(2)-induced nonlinear optical effects, a number of phase-matching techniques have been deployed to resolve the phase mismatch between the interacting waves. In this work, we report that in the quasi-phase-matching scheme, the accumulation of the phase mismatch can induce a quasi-phase-mismatch effect. And on the contrary, instead of eliminating the phase mismatch, modulating the quasi-phase-mismatch effect can lead to bandwidth enhancement and multiple-wavelength conversion. Both of these are essential factors for applications in nonlinear frequency conversion. As examples, designs with reset-periodic and cascaded-periodic optical superlattices based on such modulation are presented.
在基于χ(2)诱导非线性光学效应的传统频率转换中，已经采用了多种相位匹配技术来解决相互作用波之间的相位失配问题。在这项工作中，我们报告在准相位匹配方案中，相位失配的积累会诱导准相位失配效应。相反，不是消除相位失配，而是调制准相位失配效应可以导致带宽增强和多波长转换。这两者都是非线性频率转换应用中的关键因素。作为示例，给出了基于这种调制的具有复位周期和级联周期光学超晶格的设计。
