Anisotropy in the complex refractive index and the third-order nonlinear optical susceptibility of a stretch-oriented film of poly(p-phenylene vinylene)

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Abstract
Birefringence, dichroism, and dispersion of the refractive indices of a free‐standing film of poly(p‐phenylene vinylene) (PPV) were measured by several techniques. The results are applied to an analysis of anisotropy of the third‐order nonlinear optical susceptibility of this material. The anisotropy of both the linear and nonlinear susceptibilities is accounted for by the one‐dimensional character of the lowest‐energy electronic transition in PPV.