Nonlinear Optics of Conjugated Polymers and Linear Molecules
George I. Stegeman
The three level model for the third nonlinear optics response of symmetric molecules and conjugated polymers is discussed in detail and simplified formula are given for the spectral regions near and at the one and two photon resonances, off resonance when the damping coefficient can be neglected, and finally in the non-resonant regime where the frequency goes to zero. It is shown that the non-resonant response depends on just a few parameters and the theoretical predictions are compared with experiments on a few materials.
Keywords: Nonlinear optics, three level model, conjugated polymers, linear molecules, nonlinear absorption, nonlinear refraction.