文献类型：期刊文献

中文题名：二阶非线性光学聚氨酯对电光效应的共振增强

英文题名：Resonance Enhancement of Electro-optical Effect by Second-order Nonlinear Optical Polyurethane

作者：李旭华[1];袁荞龙[1];王得宁[1];曹庄琪[2];沈启舜[2]

机构：[1]华东理工大学材料科学与工程学院,上海200237;[2]上海交通大学分子光学实验室,上海200030

年份：2003

卷号：24

期号：9

起止页码：1683

中文期刊名：高等学校化学学报

外文期刊名：Chemical Journal of Chinese Universities

收录：CSTPCD;;EI(收录号：20134416936728);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000186134800036)】；北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金(批准号:50073005)

语种：中文

中文关键词：二阶非线性光学;聚氨酯;电光效应;共振增强;折射率

外文关键词：Second-order nonlinear optics; Cross-linked polyurethane; Electro-optical effect; Resonance enhancement

摘要：二阶非线性光学聚合物是最有希望实现在电光器件方面应用的材料之一.该类材料的非线性光学系数很高, 响应速度快, 与半导体材料的相容性较好, 且比有机和无机晶体的制备更方便[1,2].
A novel cross-linked polyurethane with high second-order nonlinear optical(NLO) activity and high thermal stability was synthesized from disperse Red-19 and the trimer of 2,4-toluene diisocyanate. The electro-optical coefficient(r33) of the polyurethane and the electro-optical modulation efficiency of the spatial modulator were measured at lasers of 632, 650, 832 and 980 nm by the improved attenuated-total-reflection technology after the polyurethane was poled and cured. The results indicate that r33 and the modulation efficiency increase in the absorption region of the polyurethane with the descending of the incident laser wavelength. Further theoretical and experimental researches show that the enhancement of the electro-optical effect is resulted from the complex refractive index change. The change increased with the ab-sorbance of the polyurethane due to the resonance of the NLO polyurethane and the incident laser. As a result, for spatial electro-optical(EO) modulator like attenuated-total-reflection EO modulator, the absorption region can be effectively utilized notonly because the effective optical path length is much shorter that of a waveguide EO modulator and optical losses do not present a serious problem but also because the electro-optical effect will be strengthened by the resonance.