Rainbow hologram

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The rainbow hologram or Benton hologram was invented in 1968 by Dr. Stephen A. Benton of MIT. Rainbow holograms can be viewed under white light illumination. The rainbow holography process includes a horizontal slot which eliminates vertical parallax and produces the familiar rainbow colors. The type of hologram found on credit cards are one example of rainbow holograms.

This invention illustrates an underlying theme of Benton's work, which was to cut down the amount of information in a hologram to that really required by the human visual system: only horizontal parallax is necessary for us to perceive depth perception. This reduces the complexity of holograms and makes them, in this case, suitable for mass reproduction.

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