Three Hundred and Sixty Degree Holography

摘要

The use of a hologram as a static three dimensional visual display is somewhat restricted by the limited viewing angle. This viewing angle is a function of the geometric relations between the size of the object to be recorded, the distance from the object to the recording medium, and the size and shape of the recording medium. A typical hologram is made on a flat photographic plate with the viewing angle consequently limited by the edges of the plate. One technique for extending the viewing angle to three hundred and sixty degrees (in one plane) is to use a flexible recording medium which extends around the object when properly illuminated. The resulting hologram yields a three hundred and sixty degree viewing angle of the three dimensional holographic image. Specific steps in the experimental development are described. Procedural problems, such as vibration and intensity non-uniformities, are discussed. Methods and equipments which lead to satisfactory holograms are outlined. A simple method for reconstruction and viewing is described. Pictures of resultant holograms are given. Consideration is given to extension of the technique to three hundred and sixty degrees in both horizontal and vertical planes. (Author)