Patent
1980-06-23
1983-03-29
Arnold, Bruce Y.
350 36, 350320, G02B 2717, G03H 104
Patent
active
043781420
ABSTRACT:
A hologram is manufactured by making a plurality of coherent spherical-wave beams, N (.gtoreq.3) in number, interfere with one after another to provide a multiplicity of interference fringe configurations. A phase subtract aspheric-wave is produced by an auxiliary hologram manufactured by the use of two of the spherical-waves. The aspheric-wave is made to interfere with a third spherical-wave or a similar aspheric-wave. Phase distribution .phi..sub.N on the interference fringes is defined by: ##EQU1## where r represents a distance on the hologram between a predetermined point and an optional point, f.sub.k is the distance between the principal surface and the point of convergence or divergence of the particular wave and ##EQU2## is the focal power of the hologram for a coherent beam of the common wavelength. In a laser beam scanner, a coherent beam of a longer wavelength is preferably used in illuminating a hologram, which may or may not be a hologram manufactured as above.
REFERENCES:
patent: 3633989 (1972-01-01), Benton
patent: 3647289 (1972-03-01), Weber
patent: 3838903 (1974-10-01), Leith et al.
Pennington, K. S. "How to Make Laser Holograms," Microwaves, Oct. 1965, pp. 35-40.
Arnold Bruce Y.
Nippon Electric Co., Ltd
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