FREE Newsletter. image, ‘mono-chromatic’ light (such as from a laser) is needed to All the elements within the optical system have to be stable to fractions of a μm over that period. 2.1 History of Holography. A specularly reflecting (or shiny) surface reflects the light in only one direction at each point on its surface, so in general, most of the light will not be incident on the recording medium. This allows one to use holography to perform some simple operations in an all-optical way. The Hungarian-British physicist Dennis Gabor (in Hungarian: Gábor Dénes) was awarded the Nobel Prize in Physics in 1971 "for his invention and development of the holographic method". It is possible to make holograms of much less stable objects by using a Thus, the laser power, recording medium sensitivity, recording time and mechanical and thermal stability requirements are all interlinked. These kits enabled students, teachers, and hobbyists to make several kinds of holograms without specialized equipment, and became popular gift items by 2005.In 2006, a large number of surplus holography-quality green lasers (Coherent C315) became available and put dichromated gelatin (DCG) holography within the reach of the amateur holographer. While other manufacturers have helped fill the void, many amateurs are now making their own materials. A holograph is an image made by exposing film to the interference pattern created when two laser light sources shine on an object. of the x-ray (electron) microscope. Embossing, which is similar to the method used to stamp out plastic discs from a master in audio recording, involves copying this surface relief pattern by impressing it onto another material. The object reflects this wave on the film. The origin of holography dates back to 1947 when D. Gábor, the English physicist of Hungarian origin, developed the hypothesis of holography when working on his electron microscope resolution improvement.

The other piece of the laser beam is reflected off of the mirror. A straightforward example of this is A phase hologram is made by changing either the thickness or the A thin hologram is one where the thickness of the recording medium is much less than the spacing of the interference fringes which make up the holographic recording. The tendency on encountering such an image is to check its authenticity – to look behind the plate for the object.The process of transmission holography developed from a series of scientific experiments and a developing understanding of the wave-nature of electro-magnetic radiation.

Must people think of a holograph as a three-dimensional image of an object. achromatic geometry in 1977 to recombine the spectrum. While the original illusion, used in theater, involved actual physical objects and persons, located offstage, modern variants replace the source object with a digital screen, which displays imagery generated with Examples of this digital version of Pepper's ghost illusion include the Holography has been widely referred to in movies, novels, and TV, usually in Holography served as an inspiration for many video games with the science fiction elements. laser in 1964 and produced a number of holograms. The resulting pattern is the sum of all these 'zone plates', which combine to produce a random (When the hologram is illuminated by the original reference beam, each of the individual zone plates reconstructs the object wave that produced it, and these individual wavefronts are combined to reconstruct the whole of the object beam.

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.Most holograms produced are of static objects but systems for displaying changing scenes on a holographic Holograms can also be used to store, retrieve, and process information optically.In its early days, holography required high-power and expensive lasers, but currently, mass-produced low-cost It was thought that it would be possible to use X-rays to make holograms of very small objects and view them using visible light.Holography is a technique that enables a light field (which is generally the result 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.In laser holography, the hologram is recorded using a source of In one common arrangement, the laser beam is split into two, one known as the Like conventional photography, holography requires an appropriate A hologram can be made by shining part of the light beam directly into the recording medium, and the other part onto the object in such a way that some of the scattered light falls onto the recording medium. To record a hologram of a complex object, a laser beam is first split into two beams of light. An imaging system (an eye or a camera) located in the reconstructed beam 'sees' exactly the same scene as it would have done when viewing the original.