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In general usage, a hologram is a recording of any type of wavefront in the form of an interference pattern. It can be created by capturing light from a real scene, or it can be generated by a computer, in which case it is known as a computer-generated hologram, which can show virtual objects or scenes.
A hologram can be copied optically by illuminating it with a laser beam, and locating a second hologram plate so that it is illuminated both by the reconstructed object beam, and the illuminating beam. Stability and coherence requirements are significantly reduced if the two plates are located very close together. [17]
Computer-generated holography (CGH) is a technique that uses computer algorithms to generate holograms.It involves generating holographic interference patterns.A computer-generated hologram can be displayed on a dynamic holographic display, or it can be printed onto a mask or film using lithography. [1]
This was demonstrated by recording a hologram of the view over one of the mirrors. In one of the holograms, however, a dark band was observed in the closest image to the hologram, and it was observed to shift position with perspective. This band was not observable in the original laser beam and had to be something created by the holographic ...
Solid holograms appear many times in the TV show Star Trek. [ 7 ] [ 8 ] In Red Dwarf , the character Rimmer is a hologram who obtains a "hard light drive", allowing him to become tangible. [ 7 ] In the animated show Steven Universe , several main characters are aliens who have physical forms made out of light, with a gemstone as the only ...
The rainbow hologram (also known as Benton hologram) is a type of hologram that was invented in 1968 by Dr. Stephen A. Benton at Polaroid Corporation (later MIT). [1] Rainbow holograms are designed to be viewed under white light illumination, rather than laser light which was required before this.
The holographic optical element is closely linked to holography (science of making holograms), a term proposed by Dennis Gabor in 1948. Since the idea of holography came around much has been done over the next few decades to try and create holograms.
Digital holography is the acquisition and processing of holograms with a digital sensor array, [1] [2] typically a CCD camera or a similar device. Image rendering, or reconstruction of object data is performed numerically from digitized interferograms.