Transient and Stationary Multiwave Mixings in Highly Nonlinear Thin Materials

该计划将涉及实验和理论研究， 高度非线性薄结构中的瞬态多波混频 材料. 实验中使用的主要材料是 液晶，但一些研究也将扩展到 半导体材料，以进一步建立 理论和观察。 在这些媒体中，最近的理论和 主要研究人员的实验表明， 有用的多波混频效应可以在 稳定状态以及瞬态状态。 拟议 研究将深入探讨几个基本有趣的， 这些影响的重要方面，特别是在瞬态 政权 这些包括：强烈的时间和 空间自和互相位调制/移位和侧移 衍射总是伴随着高效率的波混合， 非线性薄材料;相位之间的相互关系;非线性效应 调制效应和其他几何/光学/材料参数 例如激光脉冲宽度和强度、材料响应时间 和非线性（电子、热、取向、局部或 扩散等）相互作用长度，波混合角，各向异性 和双折射，偏振，温度等。这个程序的 研究将产生新的基本测量和理论 定量描述的形式化及其应用 指南，广泛的新一类非线性器件，包括梁 和图像放大器、波束组合和转向、相位共轭器 以及基于相干多波混频的自泵浦振荡器 方面的影响.

This program will involve experimental and theoretical studies of transient multiwave mixings in thin structures of highly nonlinear materials. The principal materials to be used in the experiments are liquid crystals, but some studies will also be extended to semiconductor materials to further establish the generality of the theories and observations. In these media, recent theories and experiments by the principal investigators have demonstrated that many useful multiwave mixing effects can occur efficiently in the stationary regime as well as in the transient regimes. The proposed studies will delve into several fundamentally interesting and important aspects of these effects, especially in the transient regime. These include: the roles played by intense temporal and spatial self- and mutual-phase modulations/shifts and side diffractions that invariably accompany efficient wave mixing in highly nonlinear thin materials; the interrelationship between the phase modulation effects and other geometrical/optical/material parameters such as the laser pulse width and intensities, material response time and nonlinearity (electronic, thermal, orientational, local or diffusive, etc.) the interaction length, wave mixing angle, anisotropy and birefringence, polarization, temperature, etc. This program of research will result in new fundamental measurements and theoretical formalisms for quantitative descriptions of, and application guidelines for, a broad new class of nonlinear devices including beam and image amplifiers, beam combining and steering, phase conjugator and self-pumped oscillators, based on coherent multiple wave mixing effects.