We have demonstrated anomalous-dispersion phase-matched second-harmonic generation, using electric-field-induced second-harmonic generation in a liquid solution of Foron Brilliant Blue S-R (FBB). This dye has a sharp absorption maximum near 620 nm and a deep absorption minimum near 450 nm. The microscopic hyperpolarizability (β) of FBB was measured at 1.58 and 0.954 µm and was found to be 163 × 10^-30 and -118 × 10^-30 cm⁵/esu, respectively. The change in sign of β and the observation that β₀, a frequency-independent measure of hyperpolarizability, is the same at both frequencies demonstrate the validity of the two-state model of the second-order hyperpolarizability.

© 1989 Optical Society of America

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