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Topic: Diffraction grating

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  Encyclopedia :: encyclopedia : Diffraction   (Site not responding. Last check: 2007-11-01)
Diffraction also occurs when any group of waves of a finite size is propagating; for example, a narrow beam of light waves from a laser must, because of diffraction of the beam, eventually diverge into a wider beam at a sufficient distance from the laser.
Diffraction is one particular type of wave interference, caused by the partial obstruction or lateral restriction of a wave.
The most common demonstration of Bragg diffraction is the spectrum of colors seen reflected from a compact disc: the closely-spaced tracks on the surface of the disc form a diffraction grating, and the individual wavelengths of white light are diffracted at different angles from it, in accordance with Bragg's law.
www.hallencyclopedia.com /Diffraction   (1550 words)

 stereoscopy.com - FAQ
Optical interference between the reference beam and the object beam, due to the superposition of the light waves, produces a series of intensity fringes that can be recorded on standard photographic film.
Once the film is processed, if illuminated once again with the reference beam, diffraction from the fringe pattern on the film reconstructs the original object beam in both intensity and phase.
Because both the phase and intensity are reproduced, the image appears three-dimensional; the viewer can move their viewpoint and see the image rotate exactly as the original object would.
www.stereoscopy.com /faq/holography.html   (646 words)

 Laws of Nature [Internet Encyclopedia of Philosophy]
The identity of electrical charge comes about because there is a law of nature to the effect that electrons have this charge.
The laws of physics which, for example, describe the behavior of diffraction gratings (see Harrison) were true from time immemorial and it is because of those laws that diffraction gratings, when they came to be engineered in modern times, have the peculiar properties they do.
Harrison, George R., "Diffraction grating," in McGraw-Hill Encyclopedia of Physics, edited by Sybil P. Parker, (New York: McGraw-Hill Book Co.), 1983, pp.
www.iep.utm.edu /l/lawofnat.htm   (6187 words)

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