Spectroscopic appplication of biphoton's interference. - Dmitry Korystov

Two sources of biphoton fields divided by a gap filled with an arbitrary media allow to measure dispersive properties of the media inside gap in a wide spectral region. The origin of the method is a modification of the angle-frequency line shape of spontaneous parametric scattering due to interference of biphoton fields modified by absorption and dispersion in gap. This scheme can be described as a non-linear Mach-Zender interferometer.