ABSTRACT
Spatial filtering methods are strongly connected to characteristics of holographic experimental schemes designed for recording and reconstructing Mach–Zehnder holograms. They accompany practically all stages of applications of the holographic experiment, mainly because of low spatial carrier frequencies of the holograms. The concept of cleaning a diagnostic laser beam is applicable to a narrow pencil of a continuous wave laser. This chapter discusses basic devices, equipment, and optical and mechanical elements necessary for performing Mach–Zehnder holographic interference experiments. Coherent laser sources and optical elements necessary for designing a holographic interferometer’s optical schemes are also analyzed. At the, digital CCD/CMOS sensors begin to play a determinative role in the procedure of diagnostics of the phase objects under test in aerodynamic and laser laboratories. The only shortcoming of sensors is their relatively low, limited resolving powers. For example, the full-frame CMOS sensors possess resolving powers that do not exceed ~40 mm-1.
