基于衰减全反射技术测量有机聚合物二阶非线性光学性质方法的分析-光学专业论文.docx

品的制备也只用到了真空溅射和甩膜这两种相对简单的制备工艺。本 文为不同有机聚合物二阶非线性强度的测量研究提供了一个新的实 验平台。 关键词：衰减全反射技术，有机聚合物，电光效应，光波导，复一阶 分子超极化率 Research on the Measurement of the second-order nonlinear optical property of organic polymer based on the attenuated-total-reflection technique ABSTRACT In an Attenuated-Total-Internal-Reflection (ATR) multi-layer structure, light reflectivity can be strongly dependent on layer parameters. A tiny variation of the parameters can lead to a large change in the light reflectivity. This characteristic enables us to propose a new method based on the ATR technique for the determination of the second-order optical nonlinear properties of organic polymer. Organic polymer is molecular aggregates, coupled by the weak interaction between molecules. The macroscopic nonlinear optical properties originate from the properties of the molecules. Second-order non-linear optical polymers derive their NLO properties from the first hyperpolarizability of chromophores in them. This article proposes a measurement of the complex first hyperpolarizability of chromophore for electro-optic effect at wavelength of the absorption edge. By employing the information obtained from different wave resonance dips, the values as well as the signs of both parts of the complex second hyperpolarizability are simultaneously obtained without using the Kramers–Kronig transformation. Compared with other techniques for measuring the first hyperpolarizability such as quadratic electroabsorption (QEA) technique, hyper-Rayleigh scattering (HRS) technique, the high-power pulse laser and the lock-in amplifier is no longer needed, which exhibits the benefits of low cost and convenience. KEY WORDS: Attenuated total reflection (ATR) technique; Organic polymer; Electro-optic effect; Optical waveguide; Complex first hyperpolarizability 目 录 第一章 综述 ．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．1 §1.1 非线性光学和非线性光学材料 ．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．1 §1.2 二阶非线性光学及其研究意义 ．．．．．．．．．．．．．．．．．．．．．．