Abstract

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)(−ω; 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 side-chain 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.

© 1995 Optical Society of America

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