hologram grating

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• Volume hologram — Volume holograms are holograms where the thickness of the recording material is much larger than the light wavelength used for recording. In this case diffraction of light from the hologram is possible only as Bragg diffraction, i.e., the light… …   Wikipedia

• Security hologram — 5000/10000 notes, etc. They are also used in credit and bank cards as well as quality products.Holograms are classified into different types with reference to the degree of level of optical security incorporated in them during the process of… …   Wikipedia

• Holography — (from the Greek, ὅλος hólos whole + γραφή grafē writing, drawing) is a technique that allows the light scattered from an object to be recorded and later reconstructed so that it appears as if the object is in the same position relative to the… …   Wikipedia

• optics — /op tiks/, n. (used with a sing. v.) the branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision. [1605 15; < ML optica < Gk optiká, n. use of neut. pl. of OPTIKÓS; see OPTIC,… …   Universalium

• Digital holography — is the technology of acquiring and processing holographic measurement data, typically via a CCD camera or a similar device. In particular, this includes the numerical reconstruction of object data from the recorded measurement data, in… …   Wikipedia

• holography — /heuh log reuh fee/, n. the process or technique of making holograms. [1795 1805; HOLO + GRAPHY] * * * Method of recording or reproducing a three dimensional image, or hologram, by means of a pattern of interference produced using a laser beam.… …   Universalium

• Optical vortex — An optical vortex (also known as a screw dislocation or phase singularity) is a zero of an optical field, a point of zero intensity. Research into the properties of vortices has thrived since a comprehensive paper by Nye and Berry, in 1974,[1]… …   Wikipedia

• Diffraction — Computer generated intensity pattern formed on a screen by diffraction from a square aperture …   Wikipedia

• Holographic paradigm — The holographic paradigm is a form of quantum mysticism extrapolated from two theories: * That the universe is in some sense a holographic structure proposed by David Bohm * That consciousness is dependent on holographic structure proposed by… …   Wikipedia

• Photorefractive effect — The photorefractive effect is a nonlinear optical effect seen in certain crystals and other materials that respond to light by altering their refractive indexcite book author=J. Frejlich title=Photorefractive materials : fundamental concepts,… …   Wikipedia

• Holonomic brain theory — The holonomic brain theory, originated by psychologist Karl Pribram and initially developed in collaboration with physicist David Bohm, is a model for human cognition that is drastically different from conventionally accepted ideas: Pribram and… …   Wikipedia