SPECTRAL FEATURES DUE TO DIPOLE-DIPOLE INTERACTIONS IN OPTICAL HARMONIC-GENERATION

The dipole-dipole interaction in the quantum mechanical treatment of t he matter-radiation dynamics, is shown to give rise to split energy le vels reminiscent of the nonlinear coupled spectral features, as well a s a self-sustained coherent modes. Wiener's theory of nonlinear random processes is applied to the second harmonic generation (SHG), leading also to coupled spectral pulling and dipping features, due to the dua l noise sources in the fundamental and the harmonic polarizations. Fur thermore, the nonlinear spectral features are suggested to be applied to implement quantum (qubit) gates for computation.