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The Functional Holography analysis method was first introduced in 2004 by Itai Baruchi and Eshel Ben-Jacob, for analysis of recorded human brain activity. The term hologram stands for “whole”—holo in Greek, plus “information” or “message”—gram in Greek. In a holographic photography, the information describing a 3D object is ...
It is possible to make holograms of much less stable objects by using a pulsed laser which produces a large amount of energy in a very short time (μs or less). [7] These systems have been used to produce holograms of live people. A holographic portrait of Dennis Gabor was produced in 1971 using a pulsed ruby laser. [1]: Figure 4.5, p44 [8]
The hologram keeps the information on the amplitude and phase of the field. Several holograms may keep information about the same distribution of light, emitted to various directions. The numerical analysis of such holograms allows one to emulate large numerical aperture, which, in turn, enables enhancement of the resolution of optical microscopy.
So far, the only true color hologram we've seen come from a tiny, complicated display created by a Korean group led by LG, while the rest are just "Pepper's Ghost" style illusions.
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] When a hologram is printed onto a mask or film, it is then illuminated by a coherent light source to display the holographic images.
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Diagram of one possible hologram setup. A main characteristic of a hologram is that every part of the stored information is distributed over the entire hologram. [3] Both processes of storage and retrieval are carried out in a way described by Fourier transformation equations. [24]
Since its introduction, vibrometry by holographic interferometry has become commonplace. Powell and Stetson have shown that the fringes of the time-averaged hologram of a vibrating object correspond to the zeros of the Bessel function (), where (,) is the modulation depth of the phase modulation of the optical field at , on the object. [1]