Abstract

It has long been known that the macioscopic ${\text{χ}}_{\text{αβ-y}}^{(2)}(-\text{ω;0,ω})$ of the linear electro-optic (EO effect vanishes for an isotropic chiral system^1-1if all excitations are virtual. If, however, an optical field is coupled resonantly with an electronic excited state of the chiral system, the macroscopic. EO susceptibility is nonzero with ${\text{χ}}_{\text{αβ-y}}^{(2)}(-\text{ω;0,ω})={\text{ε}}_{\text{αβy}}{\text{χ}}^{\text{(2)}}$ where ${\text{ε}}_{\text{αβy}}$ is the antisymmetric third rank tensor. We have found a new FO effect that, within the three level approximation, cart be described by the following relations.

© 1997 Optical Society of America