ABSTRACT
Note that a Mach–Zehnder interferometer can be successfully used as the basic setup for designing an optical system recording holograms with low spatial carrier frequencies, so called Mach–Zehnder holograms. Holograms. Holograms recorded on a Mach–Zehnder interferometer require the implementation of spatial filtering during the process of reconstruction. Usually Mach–Zehnder focused image holograms recorded on photographic films have relatively low carrier spatial frequencies. In classic interferometry, minimal resolvable detail of a phase object on the negative is determined mainly by the optical resolution of an imaging lens (an imaging collimator) of the Mach–Zehnder interferometer, provided that the resolution of the photographic film is higher. Schlieren information represents the redistributed light intensity on a photographic film (a Schlierengram) due to the first derivative of the refractive index in the direction perpendicular to an optical knife-edge and can be easily extracted from a signal hologram.
