Phase response of molecular media on the basis of complexes with electronic excitation energy transfer

The light-induced change of refractive index (phase response) of bichromoph ore consisting of complex organic molecules with efficient electronic excit ation energy transfer between them (the donor-acceptor model) is theoretica lly studied. It is shown that the region where donor emission bands overlap with acceptor absorption bands is nonmonotonically dependent on the bichro mophore phase response on the intensity of exciting radiation. A system is proposed for dynamic recording of light fields at the donor absorption freq uency, which uses a pulse at the acceptor emission frequency that fixes the changes.