| 摘要 |
A photographic surface is illuminated by coherent monochromatic light from a point source of radiation, such as a laser, which emits a pulsed beam modulated in phase and/or intensity according to an input signal and also generates a bundle of reference light rays incident upon that surface from successively different angles, or with variation of the relative amplitude of its constituent rays according to a continuously changing pattern, to produce an image composed of a succession of elemental holograms with different virtual origins. To reproduce the original signal, the developed image is illuminated by another bundle of coherent light rays of the same frequency varying in its angle of incidence, or in the relative amplitude of its rays, according to the same law as the first bundle; light from the image so illuminated is focused upon a photocell to generate an output voltage varying in magnitude according to the original input signal. |
