偶氮材料——乙基橙的光致双折射特性

将偶氮化合物乙基橙样品置于一对正交的偏振片之间，用一束激发光照射该样品，分别测量 在激发光的不同强度和不同偏振方向下探测光的透射功率，研究样品的双折射特性.实验表 明，透射光的饱和值和稳定值与激发光强成正比，且与激发光偏振方向有关，探测光与激发 光振动方向的夹角(θ)为45°时，其值最大；若θ不太小（>10°），sin²2θ 与透射光的饱和值、稳定值成线性关系.同时，利用巴俾涅补偿器对样品的双折射率差进 行了测量，分别得到了绿光激发前后的准确数值为1.11×10^-3和3.57×10 ^-3.关键词：偶氮双折射测量

Photoinduced birefringence in an azo-dye-doped polymer

Under varying intensities and polarization of the exciting light, the photoinduced birefringence of azo dye polymer film placed between a pair of orthogonal po larizers is studied by measuring the transmitted intensity. It is concluded that the saturation and stable values of the transmitted intensity are all proportio nal to the intensity of the exciting light. Both values are also related to the polarization direction of the exciting light, and when the angle θ between the polarization directions of the probe intensity and the exciting light is lag er than 10°, the saturation and stable values of the transmitted light are all proportional to sin²2θ. In addition, the differences in birefringenc es of the sample were measured accurately by using a compensator and 1.11×10^{-3< /sup> (before excitated) and 3.57×10-3 (after excitated) are obtaine d.}