Electro-optic Pockels and Kerr effects for the determination of χ((2))and χ((3)): thin films of side-chain polymers containing dimethylaminonitrostilbene and of the polydiacetylene poly-(butoxycarbonylmethyleneurethane).
Electro-optic Pockels and Kerr effects for the determination of χ((2))and χ((3)): thin films of side-chain polymers containing dimethylaminonitrostilbene and of the polydiacetylene poly-(butoxycarbonylmethyleneurethane).
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用于测定 χ((2)) 和 χ((3)) 的电光 Pockels 和 Kerr 效应：含有二甲氨基硝基芪和聚二乙炔聚（丁氧基羰基亚甲基氨基甲酸酯）的侧链聚合物薄膜。
作者：
M. Herold;W. Schmid;T. Vogtmann;R. Fischer;D. Haarer;M. Schwoerer
采用基于椭圆偏振术和电光Pockels效应和Kerr效应的简单反射法测定了薄膜的电光折射率χ（（2））（-ω; 0，ω）和χ（（3））（-χ; 0，0，ω）。对由中心对称分子如聚二乙炔聚（丁氧基羰基亚甲基氨基甲酸酯）（聚-4BCMU）和含有二甲基氨基硝基芪（ANS）的非中心对称极化侧链聚合物组成的材料进行了测量。将结果与通过其他方法获得的结果（例如，二次谐波产生、三次谐波产生和简并四波混频）。出现了很大的差异，特别是对于χ（（3））值。从静电力和从依赖于场的变化的吸收的机械应变的影响进行了讨论。
A simple reflection method that is based on ellipsometry and the electro-optic Pockels and Kerr effects is adapted for the determination of the electro-optic susceptibilities χ((2))(-ω; 0,ω) and χ((3))(-χ; 0, 0, ω). Measurements were made on materials that consist of centrosymmetric molecules like the polydiacetylene poly-(butoxycarbonylmethyleneurethane) (poly-4BCMU) and on a noncentrosymmetric poled sidechain polymer that contains dimethylaminonitrostilbene (ANS). The results are compared with those acquired by other methods (e.g., second-harmonic generation, third-harmonic generation, and degenerate four-wave mixing). Large differences occur, especially for the χ((3)) values. The effects of mechanical strains from electrostatic forces and from the field-dependent change of the absorption are discussed.