holograms

hologram

[hol-uh-gram, hoh-luh-]
noun Optics.
a negative produced by exposing a high-resolution photographic plate, without camera or lens, near a subject illuminated by monochromatic, coherent radiation, as from a laser: when it is placed in a beam of coherent light a true three-dimensional image of the subject is formed.
Also called holograph.


Origin:
1945–50; holo- + -gram1

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World English Dictionary
hologram (ˈhɒləˌɡræm)
 
n
a photographic record produced by illuminating the object with coherent light (as from a laser) and, without using lenses, exposing a film to light reflected from this object and to a direct beam of coherent light. When interference patterns on the film are illuminated by the coherent light a three-dimensional image is produced

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Etymonline
Word Origin & History

hologram
1949, coined by Hungarian-born British scientist Dennis Gabor, 1971 Nobel prize winner in physics for his work in holography, from Gk. holos "whole" (in sense of three-dimensional) + -gram. Holography "process of using holograms" coined 1964 from hologram on analogy of telegraphy/telegram.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

hologram hol·o·gram (hŏl'ə-grām', hō'lə-)
n.
A three-dimensional diffraction pattern of the image of an object made using holography.

The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
hologram   (hŏl'ə-grām', hō'lə-)  Pronunciation Key 
A three-dimensional image of an object made by holography.

Our Living Language  : To produce a simple hologram, a beam of coherent, monochromatic light, such as that produced by a laser, is split into two beams. One part, the object or illumination beam, is directed onto the object and reflected onto a high-resolution photographic plate. The other part, the reference beam, is beamed directly onto the photographic plate. The interference pattern of the two light beams is recorded on the plate. When the developed hologram is illuminated from behind (in the same direction as the original reference beam) by a beam of coherent light, it projects a three-dimensional image of the original object in space, shifting in perspective when viewed from different angles. Appropriately enough, the word hologram comes from the Greek words holos, "whole," and gramma, "message." If a hologram is cut into pieces, each piece projects the entire image, but as if viewed from a smaller subset of angles. The large amount of information contained in holograms makes them harder to forge than two-dimensional images. Many credit cards, CDs, sports memorabilia, and other items include holographic stickers as indicators of authenticity. Holography is used in many fields, including medicine, data storage, architecture, engineering, and the arts.
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