SGER: Optical Parametric Processes in Ferroelectric Liquid Crystal Filled Capillary Tube Waveguides

SGER：铁电液晶填充毛细管波导中的光学参数化过程

• 批准号: 9214865
• 负责人: David Walba
• 金额: $ 2.5万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-08-15 至 1994-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9214865&HistoricalAwards=false
• 关键词: SGER; Optical; Parametric; Processes; Ferroelectric

A new class of second order nonlinear optical (NLO) materials has been developed: X(2) ferro- electric liquid crystals (FLCs). Conventional FLCs readily form low- light-loss polar films in a wide range of thicknesses, and have been demonstrated as optical waveguides. The new X(2) FLCs combine the processibility of conventional FLCs with thermodynamically stable NLO susceptibility of useful magnitude. In addition, optical properties such as birefringence, dielectric permittivity, and NLO properties are highly customizable by chemical synthesis and mixing. In this Small Grant for Exploratory Research, the attractive possibility of using centimeter long, um inner diameter capillary tubes filled with X(2) FLCs for optical parametric processes will be investigated. Key questions which will be answered in this work include the following: 1) What is the intrinsic director structure in the capillary tubes--is the polarization vector field polar, and how can it be controlled? 2) What are possible phase matching schemes for FLC-cored optical waveguides? FLC alignment in capillary tubes will be examined experimentally, and the effect of FLC material parameters such as liquid crystal phase sequence, helix pitch, tilt angle, and capillary tube preparation on alignment characteristics will be determined. Using director alignment information, second harmonic generation processes will be accurately modeled by solving the wave equation with position dependent relative permittivity and nonlinear polarizability. Finally, frequency doubling of near-infrared radiation using the X(2) FLC mixture Displaytech MX-5679 in um inner diameter, centimeter long capillary tubes will be investigated experimentally.

一类新的二阶 非线性光学材料 已开发出：X（2）铁- 电液晶（FLC）。 传统的FLC容易形成低- 光损耗极性薄膜， 厚度范围，并已被 被证明是光波导。 新型X（2）FLCs联合收割机结合了 传统FLC的加工性能 具有稳定的NLO 有用量级的敏感性。 此外，光学性质，如 作为双折射，电介质 介电常数和非线性光学特性是 化学品高度定制 合成和混合。 在这个小 探索性研究补助金 有吸引力的可能性， 厘米长，嗯内径 装有X（2）FLC的毛细管 用于光学参量过程 将进行调查。 关键问题 这将在本书中得到解答 包括以下内容：1）什么是 本征指向矢结构 毛细血管是 极化矢量场极化，以及 如何控制呢？2)什么 是可能的相位匹配方案 用于FLC芯光波导？ 毛细管中的FLC对准 将通过实验进行检验， FLC材料的作用 液晶等参数 相序，螺距，倾斜 角，毛细管 对准准备 特征将被确定。 使用导向器对齐 二次谐波信息 生成过程将是 通过求解 带位置的波动方程 相关的相对介电常数和 非线性极化率 最后， 近红外倍频 使用X（2）FLC混合物的辐射 Displaytech MX-5679 in um inner 直径，厘米长毛细管 将对试管进行研究 实验性的