Dispersion relations for testing the validity of linear and nonlinear optical spectra

We exploit efficient dispersion relations, which were developed for terahertz spectroscopy, to show their validity for testing linear and nonlinear optical spectra. As an example, we deal with the measured data for complex reflectivity of a KCI crystal and complex nonlinear susceptibility of a polysilane. It is suggested that the spectral data presented in the literature both for the KCI and the polysilane are consistent with the presented spectra analysis method. (c) 2007 Optical Society of America