White-light viewable, cylindrical holograms and method of spatially filtering wavefronts
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United States of America Patent
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May 23, 1989
Issued Date -
N/A
app pub date -
Oct 29, 1985
filing date -
Sep 30, 1982
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Expired
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Abstract
A white-light viewable, cylindrical hologram is made by recording on a cylindrical recording medium the interference between a radial reference beam and an object wavefront emanating from the center of the cylindrical recording medium. In a second step, the cylindrical hologram is placed in a flat configuration and a second hologram is recorded by recording the interference between a reference beam and an object wavefront formed by directing coherent light through the first hologram. Finally, a third hologram is formed by recording the interference between a reference beam and an object wavefront formed by directing coherent light through a narrow strip of the second hologram. The third hologram is viewed by placing it in a cylindrical configuration and directing white light onto the hologram from a point source located on the axis of the cylindrical hologram.
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