Third-order nonlinear optics of organic chromophores

Possible strategies for optimization of third-order nonlinear optical response of organic chromophores are outlined and briefly discussed. The role of resonances and the usefulness of the new technique of phase tuned optically heterodyned Kerr gate in their investigations is described. In the experimental part, the χ⁽³⁾ resonant behavior of two model compounds, one of them being a representative of the newly synthesized group of phosphoylide chromophores, is investigated. The results of femtosecond phase tuned optically heterodyned OKG at the wavelength of 796 nm and DFWM at 602 nm are reported.