Multiemulsion transparency providing separate phase and amplitud

Details Multiemulsion transparency providing separate phase and amplitud Multiemulsion transparency providing separate phase and amplitud

1974-03-08

1976-05-18

Stern, Ronald J.

96 27H, 350 35, 350314, G02B 520, G02B 2700

Patent

active

039573532

ABSTRACT:
Method and apparatus for making a hologram that controls both the amplitude and the phase of a reconstructing beam of light at each point on the surface of the hologram. The hologram is a transparency made from a conventional, color reversal photographic film that has multiple emulsion layers that are each selectively photosensitive to light of different wavelengths. The desired image to be produced from the hologram is initially processed into a matrix of Fourier transformed amplitude coefficients and a matrix of Fourier transformed phase coefficients. The hologram is made by first exposing the photographic film to an illumination pattern of the Fourier amplitude coefficients using light having a spectrum to which one of the emulsions is selectively photosensitive. The film is next exposed to an illumination pattern of the Fourier phase coefficients using light having a wavelength to which another emulsion of the film is selectively photosensitive. Two separate exposures are made on the film, and each exposure photographically records a separate set of Fourier transformed data describing the image to be produced. After the transparency is developed, the desired image is reconstructed by illuminating the transparency with a coherent beam of light. One emulsion layer on the film controls the amplitude transmittance according to the Fourier amplitude data and another emulsion layer controls the phase of the reconstructing beam of light passing through the transparency in accordance with the recorded Fourier phase data. A full color holographic image is obtainable by constructing three separate holograms, reconstructing each hologram with a different primary color and combining the three primary colors together to form one image.

REFERENCES:
patent: 3045530 (1962-07-01), Tsujiuchi
patent: 3442566 (1969-05-01), Forward
Ransom, Applied Optics, Vol. 11, No. 11, Nov. 1972, pp. 2554-2561.
Marathay, Jour. of the Optical Society of America, Vol. 59, No. 6, June 1969, pp. 748-752.
Vanderlugt, Optica Acta, Vol. 15, No. 1, Feb. 1968, pp. 1-33.
Meyer et al., Jour. of the Optical Society of America, Vol. 57, No. 11, Nov. 1967, pp. 1388-1389.

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