Abstract

Conjugated π-electron organic and polymer structures are well known to exhibit unusually large nonresonant macroscopic second order ${\chi }_{\mu k}^{\left(2\right)}\left(-{\omega }_3;{\omega }_1,{\omega }_2\right)$ and third order ${\chi }_{\mu k}^{\left(3\right)}\left(-{\omega }_4;{\omega }_1,{\omega }_2,{\omega }_3\right)$ nonlinear optical susceptibilities.^1,3 The microscopic origin of the nonlinear optical properties for such systems is now well understood by π-electron multiple-excited configuration interaction theory which best describes tire electron correlation effects.⁴

© 1994 Optical Society of America