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hologram Dictionary Terms

incoherent holography
The production of holograms initially from either conventional photographs or incoherent optical equipment.
lensless microscopy
Lensless microscopy, also known as computational or holographic microscopy, is an imaging technique that captures and...
image plane holography
A hologram in which the image of an object, or the object itself, is located near the hologram recording plane, for optimum...
photopolymer hologram
A holographic plate coated by photopolymeric mixtures that are composed of one or more monomers and a photoredox catalyst...
pseudohologram
Coded image obtained optically with a nonredundant pinhole array imaging aperture.
hologram
An interference pattern that is recorded on a high-resolution plate, the two interfering beams formed by a coherent beam...
reconstructed image
An image that appears when a hologram is illuminated by a suitable light source, generally a laser beam.
Whittaker-Shannon theorem
The theorem stating that, when the sampling period in a recorded sample hologram is matched to the object spectrum, the...
white-light hologram
 integram
A reflection hologram using multiple color lasers that integrates various graphical techniques to allow the display of...
holographic matched filter
A specific type of hologram that will transmit a pure plane wave when the hologram is illuminated by the type of wave it is...
lensless Fourier transform hologram
A hologram formed without lenses and with the object and reference points sharing the same plane. In the initial recording,...
high-speed holography
The holographic recording of sequences of high-speed phenomena. With a multiple beam laser, multiple holograms that depict...
liquid-surface holography
The acoustical holographic process in which the hologram consists of slight elevations in a liquid surface, in the areas of...
electroholography
A technology that uses electrically activated holograms stored within specially developed crystals to route information in...
temporal Fourier hologram
A technique used to suppress extreme noise amplification during digital image reconstruction that relies on smoothing and...
reference beam
In holography, the beam of light that is directed from the beamsplitter to the recording medium, where it interferes with...
phase hologram
A hologram that is formed on a recording medium by changing the phase of the illuminating wave in correspondence with the...
phase mask
In optics and photolithography, a phase mask refers to a device that modifies the phase of light waves passing through it....
computer-generated hologram
A computer-generated hologram (CGH) is a holographic image produced using computational methods and algorithms, rather than...
plane hologram
A two-dimensional hologram.
absorption hologram
A hologram formed when the light of the illuminating beam is absorbed in correspondence with the recording exposure. In...
double-exposure holography
The formation of an interferogram by means of two holograms on the same recording medium, often used for determining small...
stacked hologram
The superimposing of holographic pages in a thick, erasable storage material by changing the reference and object beams....
Fourier transform hologram
A hologram formed by the recording of a plane object situated in the focal plane of a lens so that each object gives rise to...
holographic camera
A holographic camera, also known as a holographic imaging system or holographic recorder, is a specialized device used to...
venetian-blind effect
Short-distance scattering of light in holography caused by random index inhomogeneities and the developing index that...
rotating hologram
A disc composed of a series of holographic optical elements that diffract light at various angles. When spinning, a raster...
acoustical hologram
The recorded interference pattern formed by the interference of two sound beams.
volume hologram
A three-dimensional hologram.
color holography
The recording of three or more separate holograms having a different color on a medium, so that illumination with a tricolor...
holographic memory
The storage of data as bits in memory by holographic processes. The laser beam is divided into reference and object beams,...
acoustical holography
The optical reconstruction of image information contained in a sound field. First the diffraction pattern, formed by an...
hololens
A series of permanent holograms in dichromated gelatin formed by opening total page-composer apertures and setting a point...
object beam
In holography, the wave of light that illuminates the object to be recorded, which diffracts it to the recording medium,...
time-averaged holographic interferometry
Multiple exposures of holograms, one for each position of a vibrating image, that are used for vibration analysis and that...
transmission hologram
A hologram that is illuminated by a source opposite the viewer.
holocamera
A camera system used to form a high-precision hologram of the subject on a photographic plate. It contains a high-power...
in-line holography
The formation of a hologram by single reference-beam interferences with waves that are diffracted or scattered from a small...
stored beam hologram
A term referring to the pre-exposed hologram of the subject used in holographic interferometry.
conjugate holographic image
Also known as real holographic image. The indistinct, highly distorted image produced on the side of the hologram closest to...
moving aperture technique
Method for reducing laser speckle in which the object field comes from a real diffuse object or the reconstructed object...
rainbow hologram
Essentially, a hologram of a hologram, in which the first-generation hologram is masked with a narrow slit. During image...
amplitude hologram
A hologram in which diffraction is produced by the silver image, resulting in a dimmer image than in a phase hologram, where...
underillumination
Illumination of hologram facets with a beam that covers only a small portion of the hologram in order to optimize laser...
reconstruction wave
The coherent wave used to play back a recorded hologram. It is identical to the reference wave used in the generation of the...
diffractive optics
Optical elements that use diffraction to control wavefronts. Diffractive optical elements include diffraction gratings,...
engram
A hologram produced by a pair of radiation beams, each carrying information.
holographic particle velocimetry
A method of measuring flow velocity by seeding the flow with neutrally buoyant particles and using a pulsed laser to...
dynamic beam correction
The superimposition of a pilot object on each hologram. The fixed relative position of the scanning and pilot beam during...
processed hologram
A superposition of many zone plates, each reconstructing a real and virtual point image at the appropriate locations upon...
modulated grating hologram
A computer-generated, phase-and-amplitude, off-axis hologram made by a multi-exposure technique that uses three computer...
reflection hologram
A hologram that is illuminated by a source from the viewer's side.
photopolymerization
A process in which a mixture of one or more monomers, plus a catalyst, polymerize under exposure to light radiation....
microhologram
A hologram having an image scale that is orders of magnitude smaller than microfiche images.
multicolor hologram
A hologram formed by reconstruction of multicolor wavefronts. The system used to produce the hologram is designed to combine...
Fresnel hologram
A hologram formed with an object located close to the recording medium.
overillumination
A hologram facet illumination technique in which the illuminating beam is twice the size of the hologram facet so that full...
holographic interferometry
The interferometric analysis of a complex object by utilizing the three-dimensional hologram. By causing a laser beam to...
thin hologram
A two-dimensional hologram.
digital holographic microscopy
Digital holographic microscopy (DHM) is an advanced imaging technique that combines holography and digital image processing...
holographic tomography
Holographic tomography is an advanced imaging technique that combines holography and tomography to provide three-dimensional...
synthetic interferometric image
An imaging technique in which an object moving through an interference field formed in space scatters light and is spatially...
embossed hologram
A hologram imprinted on plastic or another medium; e.g., those commonly found on credit cards.
Fraunhofer hologram
A far-field pattern holographically reproduced image that is categorically considered with three-dimensional lensless...
double-pass transmittance hologram
A hologram having an object wave that has been transmitted through the transparent object media to a mirror, reflected again...

(66 results found)

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