高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (9): 1683.

• 研究简报 • 上一篇    下一篇

二阶非线性光学聚氨酯对电光效应的共振增强

李旭华1, 袁荞龙1, 王得宁1, 曹庄琪2, 沈启舜2   

  1. 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
  • 收稿日期:2002-04-29 出版日期:2003-09-24 发布日期:2003-09-24
  • 通讯作者: 王得宁(1943年出生),男,教授,博士生导师,主要从事光学及特种聚合物材料研究.E-mail:wangdening@hotmail.Com E-mail:wangdening@hotmail.Com
  • 基金资助:

    国家自然科学基金(批准号:50073005)

Resonance Enhancement of Electro-optical Effect by Second-order Nonlinear Optical Polyurethane

LI Xu-Hua1, YUAN Qiao-Long1, WANG De-Ning1, CAO Zhuang-Qi2, SHEN Qi-Shun2   

  1. 1. Institute of Materials Science and Engineering, East China University ofScience and Technology, Shanghai 200237, China;
    2. Molecular Optics Laboratory, Shanghai Jiaotong University, Shanghai 200030, China
  • Received:2002-04-29 Online:2003-09-24 Published:2003-09-24

PDF (PC)

被引次数

4

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.目前所用的电光调制器多为光传输型,高光学活性的极化聚合物一般光学损耗较大,尤其是其吸收波段更大,使得调制器只能在其透明波段内使用,否则,传输型波导器件由于这种损耗将无法使用.

关键词: 二阶非线性光学, 交联聚氨酯, 电光效应, 共振增强

Abstract: Anovel 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 r33and 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 EOmodulator, 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.

Key words: Second-order nonlinear optics, Cross-linked polyurethane, Electro-optical effect, Resonance enhancement

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