The Holographic Versatile Disc (HVD) is an optical disc technology developed between April 2004 and mid-2008 that can store up to several terabytes of data on an optical disc 10 cm or 12 cm in diameter. The reduced radius reduces cost and materials used. It employs a technique known as collinear holography, whereby a green and red laser beam are collimated in a single beam. The green laser reads data encoded as laser interference fringes from a holographic layer near the top of the disc. A red laser is used as the reference beam to read servoinformation from a regular CD-style aluminium layer near the bottom. Servoinformation is used to monitor the position of the read head over the disc, similar to the head, track, and sector information on a conventional hard disk drive. On a CD or DVD this servoinformation is interspersed among the data. A dichroic mirror layer between the holographic data and the servo data reflects the green laser while letting the red laser pass through. This prevents interference from refraction of the green laser off the servo data pits and is an advance over past holographic storage media, which either experienced too much interference, or lacked the servo data entirely, making them incompatible with current CD and DVD drive technology.
EOTech is an American company that designs, manufactures, and markets electro-optic products and systems. The company is headquartered in Ann Arbor, Michigan. They produce holographic weapon sights for small arms that have been adopted by various military and law enforcement agencies as close quarters battle firearm sights.
Emmett Norman Leith was a professor of electrical engineering at the University of Michigan and, with Juris Upatnieks of the University of Michigan, the co-inventor of three-dimensional holography.
Lloyd Cross is an American physicist and holographer.
Holographic interferometry (HI) is a technique which enables static and dynamic displacements of objects with optically rough surfaces to be measured to optical interferometric precision. These measurements can be applied to stress, strain and vibration analysis, as well as to non-destructive testing and radiation dosimetry. It can also be used to detect optical path length variations in transparent media, which enables, for example, fluid flow to be visualised and analyzed. It can also be used to generate contours representing the form of the surface.
Digital holography refers to the acquisition and processing of holograms with a digital sensor array
, typically a CCD camera or a similar device. Image rendering, or reconstruction of object data is performed numerically from digitized interferograms. Digital holography offers a means of measuring optical phase data and typically delivers three-dimensional surface or optical thickness images. Several recording and processing schemes have been developed to assess optical wave characteristics such as amplitude, phase, and polarization state, which make digital holography a very powerful method for metrology applications
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Computer-generated holography (CGH) is the method of digitally generating holographic interference patterns. A holographic image can be generated e.g. by digitally computing a holographic interference pattern and printing it onto a mask or film for subsequent illumination by suitable coherent light source.
Frank DeFreitas is the maintainer of the website HoloWorld, aimed at amateur holographers, and author of Shoebox Holography. He instructs people new to holography how to make simple holograms, for example by using a laser pointer.
Stephen Anthony Benton (1941–2003) was the E. Rudge ('48) and Nancy Allen Professor of Media & Sciences, and the Director for Center for Advanced Visual Studies (CAVS) at Massachusetts Institute of Technology. He was the inventor of the rainbow hologram and a pioneer in medical imaging and fine arts holography. Benton held 14 patents in optical physics and photography, and taught media arts and sciences at MIT.
The International Hologram Manufacturers Association (IHMA) is a not for profit organisation based in Sunbury-on-Thames designed to represent and promote the interests of hologram manufacturers and the hologram industry, worldwide. Founded in 1993, the association currently represents 89 members worldwide, and hosts an awards ceremony each year at the HoloPackHoloPrint conference designed to reward those whose outstanding contributions to holography advance the industry. The association has secretariat offices in both Europe and America.
Nicholas (Nick) John Phillips was an English physicist, notable for the development of photochemical processing techniques for the color hologram. Holograms typically used to have low signal-to-noise ratios, and Phillips is credited as the pioneer of silver halide holographic processing techniques for producing high-quality reflection holograms.
A holographic display is a type of display that utilizes light diffraction to create a virtual three-dimensional image of an object. Holographic displays are distinguished from other forms of 3D imaging in that they do not require the aid of any special glasses or external equipment for a viewer to see the image.
The Musée de l'Holographie was a notable museum of holography located in Paris, France. The museum was established in 1980, and located for some years in the Forum des Halles. According to S. Johnston, it closed its doors in 1994. But in fact, it was in April 1996. The museum's collections are now shown in touring exhibits in France and around the world.
Digital holographic microscopy (DHM) is digital holography applied to microscopy. Digital holographic microscopy distinguishes itself from other microscopy methods by not recording the projected image of the object. Instead, the light wave front information originating from the object is digitally recorded as a hologram, from which a computer calculates the object image by using a numerical reconstruction algorithm. The image forming lens in traditional microscopy is thus replaced by a computer algorithm.
Other closely related microscopy methods to digital holographic microscopy are interferometric microscopy, optical coherence tomography and diffraction phase microscopy. Common to all methods is the use of a reference wave front to obtain amplitude (intensity) and phase information. The information is recorded on a digital image sensor or by a photodetector from which an image of the object is created (reconstructed) by a computer. In traditional microscopy, which do not use a reference wave front, only intensity information is recorded and essential information about the object is lost.
Specular holography is a technique for making three dimensional imagery by controlling the motion of specular glints on a two-dimensional surface. The image is made of many specularities and has the appearance of a 3D surface-stippling made of dots of light. Unlike conventional wavefront holograms, specular holograms do not depend on wave optics, photographic media, or lasers.
Specialized Enterprise Holography Ltd. is a company that specializes in production of holograms and holographic security elements. Holography, a member-company of the EDAPS Consortium, is among the founders of the security printing industry in Ukraine. Established in 2000 with the support of the International Centre the Institute of Applied Optics on behalf of the National Academy of Sciences of Ukraine. Holography Ltd. is a member of the International Hologram Manufacturers Association (IHMA), a member of the International Society for Optical Engineering (SPIE) and a member of the Counterfeiting Intelligence Bureau at the International Chamber of Commerce of Ukraine.
Juris Upatnieks is a Latvian-American physicist and inventor, and pioneer in the field of holography.
Margaret Benyon,, was a British artist. Trained as a painter, she was one of the first artists to use holography as a medium and had her first solo show of holograms in 1969. She was appointed to the Order of the British Empire in 2000 for her service to art and has been called "the mother of British holography".
