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Aug 30, 2023 · There are two basic categories of holograms — transmission and reflection. Transmission holograms create a 3-D image when monochromatic light, or light that is all one wavelength, travels through them. Reflection holograms create a 3-D image when laser light or white light reflects off of their surface.
- Tracy V. Wilson
- How Holograms Work
- What Can We Use Holograms for?
- Who Invented Holograms?
Photo: The dove on this credit-card hologram seems to rotate as you tilt the card in the light. Laser light is much purer than the ordinary light in a flashlight (torch) beam.In a flashlight beam, all the light waves are random and jumbled up. Light in a flashlight beam runs along any old how, like schoolchildren racingdown a corridor when the bell...
Photo: The hologram on this DVD case is designed to deter copyright piracy. Until the 1980s, holograms were a slightly wacky scientific idea.Then someone found a way of printing them onto metallic film and theybecame an incredibly important form of security. Proper glassholograms look much more impressive than the tiny metallic ones yousee on bankn...
Holograms were invented by a brilliant Hungarian-born physicist namedDennis Gabor (1900–1979) while he wasworking in the UK. He'd been researching optical physics in the 1940s, and carried out his breakthrough work inholography in the early 1950s. The remarkable thing about his invention is that it was many years ahead of its time:lasers, which mad...
Holography is a technique that enables a wavefront to be recorded and later reconstructed. It is best known as a method of generating three-dimensional images, and has a wide range of other uses, including data storage, microscopy, and interferometry. In principle, it is possible to make a hologram for any type of wave.
Mar 2, 2019 · A hologram forms a three-dimensional image because light interference patterns are recorded, not just reflected light. To make this happen, a laser beam is split into two beams that pass through lenses to expand them.
- Anne Marie Helmenstine, Ph.D.
May 23, 2013 · Holography is a photographic technique that records the light scattered from an object, and then presents it in a way that appears three-dimensional....
- Robert Workman
A hologram is made by superimposing a second wavefront (normally called the reference beam) on the wavefront of interest, thereby generating an interference pattern which is recorded on a physical medium. When only the second wavefront illuminates the interference pattern, it is diffracted to recreate the original wavefront.
Oct 11, 2024 · The photographic recording of the image is called a hologram, which appears to be an unrecognizable pattern of stripes and whorls but which—when illuminated by coherent light, as by a laser beam—organizes the light into a three-dimensional representation of the original object.
