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8,236 terms
Photonics Dictionary
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holographic microscopy
The holographic recording of a microscopic specimen whereby magnification is achieved by alteration in a wavelength or radius of curvature between recording and reconstruction of the wavefront. With...
holographic nondestructive testing
The application of coherent wavefront techniques to the determination of the physical state of a system without appreciably altering that state.
holographic optical element
A component used to modify light rays by diffraction; the HOE is produced by recording the interference pattern of two laser beams and can be used in place of lenses or prisms where diffraction...
holographic particle velocimetry
A method of measuring flow velocity by seeding the flow with neutrally buoyant particles and using a pulsed laser to holographically record particle displacement during a short time period. An...
holographic tomography
Holographic tomography is an advanced imaging technique that combines holography and tomography to provide three-dimensional reconstructions of transparent or weakly scattering objects with high...
holography
Holography is a technique used to capture and reconstruct three-dimensional images using the principles of interference and diffraction of light. Unlike conventional photography, which records only...
hololens
A series of permanent holograms in dichromated gelatin formed by opening total page-composer apertures and setting a point source of light in each storage location. It performs much like a...
holomorphic
With respect to a crystal, the characteristic of possessing two ends symmetrical with each other.
homeotropic orientation
The perpendicular orientation of the molecular axes of the nematic molecules in a nematic crystal, relative to the electrode plates.
homing guidance system
A system of sensors and related instrumentation that allows a navigable object (usually a missile) to locate its destination by some distinguishing characteristics of that target, and then calculate...
homocentric
A term applied to rays that possess the same focal point, which may be infinity, thereby meaning that the rays are parallel.
homodyne receiver
A type of receiver utilizing a local oscillator phase-locked to the incoming signal.
homogeneous
That property of a substance that determines that all components of volume are the same in composition and optical properties.
homogeneous broadening
The broadening of a laser's line width in a way that affects every atom (or molecule), and thus the whole system, in the same manner. Examples are collision broadening, and natural or intrinsic...
homogeneous cladding
That part of the cladding wherein the refractive index is constant within a specified tolerance, as a function of radius.
homogeneous multilayer coating
A thin film of absorbing or nonabsorbing layers in which the absorption of radiation at any point is directly proportional to the electrical field intensity at that point.
homogeneous orientation
The parallel orientation of the molecular axes of the nematic molecules in a nematic crystal, relative to the electrode plates.
homogeneous x-rays
X-rays of one frequency or a narrow band of frequencies.
homogenous light
Homogeneous light refers to light that is uniform in intensity and color across a given area or space. In other words, homogeneous light sources produce illumination that is consistent and evenly...
homojunction
A junction between semiconductors that differ in their doping level conductivities but not in their atomic or alloy compositions.
honeycomb table
An optical test table made up of two outer layers or "skins'' bonded to either side of a honeycomblike core, usually of aluminum or steel. It results in equal quality with greatly reduced weight...
horizon detector
An infrared device used in satellites and rockets to determine a heat horizon for the Earth at altitudes (above 200 miles) where the visible horizon cannot be discerned. The device scans the infrared...
horizontal blanking interval
In television, the period during which the electron beam is cut off while the raster returns from the right-hand side of the screen to the left.
horizontal chromatography
A type of paper chromatography that produces a chromatogram that is horizontal instead of vertical.
horizontal drive control
A device that controls the output of a television receiver's horizontal oscillator.
horizontal resolution
In television, the number of individual pixels that can be distinguished in a horizontal scanning line; also called horizontal definition.
horizontal temperature gradients
Horizontal concentrations that comprise the dominant factor in atmospheric gradient correction. The range bias near due north and due south azimuths coincides with the systematic decrease in surface...
horizontal travel
The rotation of an instrument (or the line of sight of an optical system) in a horizontal plane; transverse.
horopter
The locus of the points in the field of binocular vision that are observed singly. The images of these points correspond to the respective retinal points.
hot extrusion
A method of manufacturing polycrystalline infrared-transmitting optical fiber by heating a single halide crystal billet and forcing it through a die.
hot mirror
A mirror with a coating that reflects infrared radiation and transmits visible light.
hot spot
Term applied to laser technology to denote an area of above-average intensity often attributable to atmospheric inconsistencies.
HPA
high-power amplifier
HPD
hematoporphyrin derivative
HPFL
high-power fiber laser
HPLC
high-performance liquid chromatography
HPP
half-power point
HPV
holographic particle velocimetry
HR
high resolution
HRI
high-resolution imaging
HRIR
high-resolution infrared radiometer
HRPT
high-resolution picture transmission
HRV
high-resolution visible
HTL
high-threshold logic
HTS
high-throughput screening
hub
The center of a local area network in the star topology.
Hubble effect
->
redshift
The displacement of spectrum lines, as determined by the increasing distance between, and the relative velocity of, the observer and a light source, causing the lines to move toward the red portion...
Hubner rhomb
A glass rhomb that is used in photometry to compare two illuminated surfaces. This is accomplished by the rhomb's angles, which transmit two light beams, one from each of the two surfaces, so that...
hue
The perceptual term for that aspect of color described by words such as red, yellow or blue. Achromatic colors, such as white, gray and black, do not exhibit hue.
Huefner spectrophotometer
A visual spectrophotometer with a rhomb located directly before the entrance aperture of a constant-deviation spectrophotometer.
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Photonics Dictionary
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