Abstract

The spectral dependence of the third-order nonlinear susceptibility χ(3) (ω; ω, −ω, ω) of the polydiacetylene 9-BCMU has been measured, and the imaginary component is found to change sign in the exciton absorption tail. In the red-phase material, a significant refractive nonlinearity was observed around the 1.93-eV input energy range, whereas the absorption change was too small to quantify. A magnitude for the nonlinear refractive index coefficient |n2| = 1.9 (±1.0) × 10−10 cm2 W−1 was measured at this Im χ(3) = 0 position, indicating good figures of merit for all-optical switching.

© 1993 Optical Society of America

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