Word: holograms
(lookup in dictionary)
(lookup stats)
Dates: during 1970-1979
Sort By: most recent first
(reverse)
...LOOKED AT HIM more closely. A little old, maybe, but that spark of wit was all that counted. The baggy, slightly rumpled suit, the black lace-ups, the slight paunch (was it all just a hologram?) could not conceal the powerful, massive frame which lay beneath it all. It was a stage veneer, nothing more; surely, this was a man who deserved Respect. I pumped his hand earnestly...
...until about a year ago that he and his colleagues-Maurice Halioua, Venugopal Srinivasan and Raghupathy Sarma-hit upon their potentially revolutionary process. Explains Stroke: "We realized that a crystal, in which the atoms are arranged in a repeating array, can be made to produce a sort of hologram, a three-dimensional display of data. What we've figured out is a way of viewing...
...bounce off the atoms are used to make a pattern of dots that is recorded by an electronic counter. The diffraction pattern is then processed by computers to determine the relative value of each of its spots. Finally, the spots are printed on a photographic plate, which becomes a hologram of one of the crystal's planes...
Promising Results. To view the hologram is easy. A beam from a helium-neon laser is passed through one lens, which spreads it to cover the entire plate, through the plate itself and then through another lens, which acts as an optical computer and converts the spots into a coherent picture (see diagram). The result is an image showing the arrangement of atoms in one plane of the crystal. This image can be combined with images from other sections to give a three-dimensional view of the crystal's entire atomic structure. Says Stroke: "In the past...
...waves happened to coincide, the waves strengthened one another and produced a bright spot on the film. But if the crests of one wave lined up with the troughs of another, the waves tended to cancel each other out and barely registered on the film. The result was a hologram, a pattern of light and dark spots that while formless to the eye, encoded all the characteristics of the object. When Gabor shined the same single-frequency light through the film, the result was a three-dimensional image of the object...