Hologram copying (review)

An analysis is made of various hologram copying methods and of the limits of their recommended use. The structure of the near-field Fresnel pattern is considered from the point of view of interference copying of holograms. An equation is derived for a thin copy prepared by the interference method. A study is made of the influence exerted on the properties of interference copies by the type of the original hologram, gap between this hologram and a copying material, shape of the copying wavefront, and copying radiation wavelength. Estimates are obtained of the aberrations of a hologram copy. Special features of the interference copying of Fourier microholograms and their arrays are considered. Hologram copying systems are described.