Abstract

The interference of spontaneous radiation emitted from two macroscopic regions (nonlinear analogous of Mach-Zehnder interferometer) is considered. Interferometer is based on two nonlinear crystals LiNbO ₃xMg0 5%, excited in series by a common laser pump beam[1] The crystals are separated by a layer with unknown dispersion law It was shown that frequency-angular intensity distribution of scattered light formed in far field zone contains quantitative information about dispersion properties of the substance placed between two nonlinear crystals. We discuss possibilities of technique, which allows to study dispersion of gases, liquids and solids in wide spectral range like by well-known spectroscopy of spontaneous parametric scattering or scattering by polaritons However nonlinear interferometry does not require that intermediate substance has quadratic susceptibility [2]

© 2000 IEEE