About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 64. Chapters: Asher A. Friesem, Australian Holographics, CAVEman, Check weigher, Computer-generated holography, Dieter Jung (artist), Digital holography, Digital planar holography, DualDisc, Electron holography, Emmett Leith, Frank DeFreitas, Functional holography, Haptic technology, Hiro Yamagata (artist), Hogel, Hologram bracelet, Hologram trademark, Holographic display, Holographic interference microscopy, Holographic interferometry, Holographic optical element, Holographic principle, Holographic screen, Holographic sensor, Holonomic brain theory, HoloVID, Holoxica Limited, Imagination Dead Imagine, Interferometric microscopy, International Hologram Manufacturers Association, Kinebar, Leonard Susskind, Lloyd Cross, MIT Museum, Moyses Baumstein, Nicholas J. Phillips, Organic photorefractive materials, Phase-coherent holography, Photorefractive effect, Polishing hologram, Rainbow hologram, Reciprocity (photography), Reference beam, Rod C. Alferness, Scanning Near Field Ultrasound Holography, Security hologram, SeeReal Technologies, Signal beam, Specular holography, Stephen Benton, Volume hologram, William J. Beaty, X-ray fluorescence holography, Yuri Nikolaevich Denisyuk, Zebra Imaging. Excerpt: Holography is a technique which enables three-dimensional images to be made. It involves the use of a laser, interference, diffraction, light intensity recording and suitable illumination of the recording. The image changes as the position and orientation of the viewing system changes in exactly the same way as if the object were still present, thus making the image appear three-dimensional. The holographic recording itself is not an image; it consists of an apparently random structure of either varying intensity, density or profile. The Hungarian-British physicist Dennis Gabor (in Hungarian: Gabor Denes), 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 word holography comes from the Greek words (holos; "whole") and (graf; "writing" or "drawing"). Portrait of Yuri Denisyuk, by Dieter JungThe 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 the 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 develo
