Computer-generated hologram fabrication process, and hologram-recorded medium

A process for fabricating a computer-generated hologram with an optical pattern recorded on a given recording surface by computer-aided computations, which comprises steps of:

• defining 2 to K original images and a recording surface for recording the original images,
• defining a multiplicity of sample light sources on each original image,
• defining a given angle of spreading for object light emitted from individual sample light sources,
• determining an area on the recording surface, at which object light emitted from all sample light sources defined on one original image arrive with a limited angle of spreading, as a recording area corresponding to said one original image, thereby defining recording areas corresponding to each of the K original images,
• assigning priorities to a plurality of recording areas when the plurality of recording areas overlap one another on the recording surface, so that a recording area having higher priority is preceded over the rest with
• respect to an overlapping portion, thereby eliminating the overlapping portion, and
• defining a multiplicity of computation points on the recording surface, so that on each computation point, a complex amplitude at the position of said computation point of object light emitted from sample light sources on the original image, to which said computation point is allocated and from which an overlapping portion has been eliminated, is computed thereby defining a specific amplitude and a specific phase on individual computation points, and locating a physical cell having optical properties consistent with the specific amplitude and specific phase in the vicinity of individual computation points so that a hologram-recording surface for the K original images is formed by a set of physical cells.