Interferometry of spontaneous parametric light scattering

The interference of biphotonic light produced in the process of spontaneous parametric scattering (SPS) in two spatially separated non-centrally symme tric crystals is considered. A scheme of the nonlinear Mach-Zehnder interfe rometer is realised. It is shown that in this case, the frequency-angular i ntensity distribution in the far-field zone (the SPS spectrum) contains inf ormation not only on non-centrally symmetric crystals, where biphotonic fie lds are created, but also on the optical properties of the medium located b etween the scattering crystals. The algorithms for the determination of the dispersion law in this medium are developed.