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Thread: Miscellaneous

  1. #1


    Touchable Holography

    Uploaded on Jul 16, 2009

    We will present "Touchable Holography" at
    SIGGRAPH 2009 Emerging Technologies.

  2. #2

    How-To: Holography

    Uploaded on Nov 24, 2011

    Did you know that you can make your own holograms? Matt Richardson shows you how to do just that with the Litiholo Kit

  3. #3

    Holograms, Holographs: "Introduction to Holography" 1972 Encyclopaedia Britannica Films

    Published on Sep 16, 2012

    Overview and history

    The Hungarian-British physicist Dennis Gabor (Hungarian name: G?bor D?nes), was awarded the Nobel Prize in Physics in 1971 "for his invention and development of the holographic method". His work, done in the late 1940s, built on pioneering work in the field of X-ray microscopy by other scientists including Mieczys?aw Wolfke in 1920 and WL Bragg in 1939. The discovery was an unexpected result of research into improving electron microscopes at the British Thomson-Houston Company in Rugby, England, and the company filed a patent in December 1947 (patent GB685286). The technique as originally invented is still used in electron microscopy, where it is known as electron holography, but optical holography did not really advance until the development of the laser in 1960.

    The development of the laser enabled the first practical optical holograms that recorded 3D objects to be made in 1962 by Yuri Denisyuk in the Soviet Union and by Emmett Leith and Juris Upatnieks at University of Michigan, USA. Early holograms used silver halide photographic emulsions as the recording medium. They were not very efficient as the grating produced absorbed much of the incident light. Various methods of converting the variation in transmission to a variation in refractive index (known as "bleaching") were developed which enabled much more efficient holograms to be produced.

    Several types of holograms can be made. Transmission holograms, such as those produced by Leith and Upatnieks, are viewed by shining laser light through them and looking at the reconstructed image from the side of the hologram opposite the source. A later refinement, the "rainbow transmission" hologram, allows more convenient illumination by white light rather than by lasers. Rainbow holograms are commonly used for security and authentication, for example, on credit cards and product packaging..

    Another kind of common hologram, the reflection or Denisyuk hologram, can also be viewed using a white-light illumination source on the same side of the hologram as the viewer and is the type of hologram normally seen in holographic displays. They are also capable of multicolour-image reproduction.

    Specular holography is a related technique for making three-dimensional images by controlling the motion of specularities on a two-dimensional surface. It works by reflectively or refractively manipulating bundles of light rays, whereas Gabor-style holography works by diffractively reconstructing wavefronts.

    Most holograms produced are of static objects but systems for displaying changing scenes on a holographic volumetric display are now being developed.

    In its early days, holography required high-power expensive lasers, but nowadays, mass-produced low-cost semi-conductor or diode lasers, such as those found in millions of DVD recorders and used in other common applications, can be used to make holograms and have made holography much more accessible to low-budget researchers, artists and dedicated hobbyists.

    It was thought that it would be possible to use X-rays to make holograms of molecules and view them using visible light. However, X-ray holograms have not been created to date.

    How holography works

    Holography is a technique that enables a light field, which is generally the product of a light source scattered off objects, to be recorded and later reconstructed when the original light field is no longer present, due to the absence of the original objects. Holography can be thought of as somewhat similar to sound recording, whereby a sound field created by vibrating matter like musical instruments or vocal cords, is encoded in such a way that it can be reproduced later, without the presence of the original vibrating matter...

  4. #4

    How holograms are made

    Published on Oct 20, 2014

    While in New York, Norm stops by Holographic Studios, one the last remaining independent holography galleries and photography studios still operating. Its founder, Jason Sapan, has spent almost 40 years practicing the art of holographic imagery. We figure he's the best person to explain to us what exactly is a hologram, and how they're painstakingly made.

    Learn more about holography and Jason Sapan's Holographic Studios at

  5. #5

    Turn your smartphone into a 3D hologram

    Published on Aug 1, 2015

    Bored of New Apps? This is my tutorial on how to turn your phone into a Hologram Projector!

  6. #6

    Japanese scientists create touchable holograms

    Published on Nov 30, 2015

    Japanese scientists create touchable holograms, believing this could contribute to architecture and medicine. Jim Drury reports.

  7. #7

    Pictures in the air: 3D printing with light

    Published on Jan 24, 2018

    A glowing image resembling a futuristic hologram floats in mid-air. This is a 3D volumetric display. Using a tiny particle suspended in laser light, researchers have been able to create high resolution, colour images that take up real 3D space. Developing this technology could lead to the kind of complex, interactive displays common in science fiction.
    "Physicists create Star Wars-style 3D projections — just don’t call them holograms"
    Laser and particle system produces three-dimensional moving images that appear to float in thin air.

    by Elizabeth Gibney
    January 24, 2018

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