Holographic Projectors for Three-dimensional Static Images

Abstract

Properties of optical regimes for a new class of projection equipment—holographic projectors for three-dimensional static images with point-focusing holographic screens are discussed. Optimal regimes are described for producing projection holograms, making it possible to obtain a screen image of the desired quality. The relationship is found between the sizes and number of projection holograms necessary for obtaining a screen image storing a required quantity of information. Expressions for parameters of printing and projection lenses are defined to enable the transfer of all the original information to the holographic screen with minimum losses of light and preservation of the three-dimensional image quality. Regimes for double-lens holographic projectors are discussed where viewing zones are formed for the left and right eyes separately, which makes the creation of a viewing zone of width not less than that of the human interocular unnecessary. For portable double-lens holographic projectors, taking, printing and projection of holograms is simplified, making possible the coherent taking of a primary hologram using practically any lens. The size of the projection optical system may be reduced and the screen image aberration becomes lower, the image preserving its three-dimensional nature. The important new procedure outlined discusses the viewing of magnified images of a monochromatic reflection hologram using transmissive holographic screens. The normal dispersive difficulty of such screens is overcome by the narrowband reflectance of the hologram object.