Hologram Facts



  • Holograms are three-dimensional photographic images made with laser lights.
  • The idea of holograms was suggested by Hungarian-born British physicist Dennis Gabor in 1947. The idea could not be tried until laser light became available.
  • The first holograms were made by Emmett Leith and Juris Upatnieks in Michigan, USA, in 1963 and by Yuri Denisyuk in the Soviet Union.
  • Virtual reality headsets allow the viewer to see 3-D images by showing slightly different images to each eye. 118
  • Some holograms work in ordinary light, such as those used in credit cards to stop counterfeiting.
  • Holograms are used to detect defects in engines and airplanes, and forgeries in paintings by comparing two holograms made under slightly different conditions.
  • Huge amounts of digital data can be stored in holograms in a crystal.
  • In 1993 10,000 pages of data were stored in a lithium nobate crystal measuring just 1 cm across. 119
  • To make a hologram, the beam from a laser light is split in two. One part of the beam is reflected off the subject onto a photographic plate. The other, called the reference beam, shines directly onto the plate.
  • The interference between light waves in the reflected beam and light waves in the reference beam creates the hologram in complex microscopic stripes on the plate.
  • Some holograms only show up when laser light is shone through them.