Abstract

A comparative study of the second-harmonic efficiency of monomolecular coverages of organic dyes has been performed. Although a simple excitation geometry has been used, the study reveals important relations among orientation, chemical structure, and nonlinear polarizability. In particular, pyridine compounds of appropriate chain length show a high hyperpolarizability ${\overline{\overline{\alpha }}}^{(2)}$ and also a high nonlinear surface polarizability ${{\overline{\overline{\chi }}}_s}^{(2)}$ owing to regular self-alignment.

© 1987 Optical Society of America

Efficient second-harmonic generation in single crystals of 2-(N,N-dimethylamino)-5-nitroacetanilide

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