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dispersion Dictionary Terms

chromatic dispersion
glass barium
A type of glass containing barium oxide, which is added to increase the refractive index while maintaining a relatively low...
dispersive power
A measure of the dispersive properties of a glass. The relative dispersion is defined as: where C, D, and F refer to the...
damped least squares
An organizational method used in optical design computer programs. The technique produces one number (merit function) to...
four-wave mixing
A phenomenon that occurs in WDM and DWDM systems when three closely spaced signal wavelengths near the zero-dispersion...
relative dispersion
 mean dispersion
dispersion filter
A complex filter that uses polarization and interference to transmit light that is nearly monochromatic.
self-phase modulation
Self-phase modulation (SPM) is a nonlinear optical phenomenon that occurs when an intense laser beam passes through a...
holographic grating
A holographic grating is a type of diffraction grating that is produced using holographic recording techniques. It consists...
intramodal distortion
That distortion resulting from dispersion of the group velocity of a propagating mode. It is the only distortion occurring...
zero-dispersion wavelength
In a single-mode optical fiber, the wavelength that causes material dispersion and waveguide dispersion to cancel each...
dispersion-flattened single-mode fiber
A type of glass optical fiber that provides low pulse dispersion over a broad portion of the light spectrum and as a result...
time smear
The elongation of a transmitted data pulse through a fiber optic due to the chromatic dispersion of the fiber material.
crown glass
One of the two principal types of optical glass, the other being flint glass. Crown glass is harder than flint glass, and...
Abbe-Porro prism
A reflecting prism that inverts the image. The image is reflected four times internally and emitted laterally. The prism is...
Abbe refractometer
Device which measures the index of refraction of glass as well as the dispersion over visible range.
diffraction grating
A diffraction grating is an optical component consisting of a surface with a periodic structure of equally spaced, parallel...
conic refraction
The dispersion of a light ray striking the surface of a biaxial crystal, in which the resulting rays are reflected in a...
dispersion
Dispersion refers to the phenomenon where different wavelengths (colors) of light travel at different speeds when passing...
Lorentz oscillator model
The Lorentz oscillator model is a theoretical model used in physics to describe the response of a charged particle (such as...
profile dispersion
In an optical waveguide, that dispersion attributable to the variation of refractive index profile with wavelength. The...
fiber optic cable assembly
A fiber optic cable assembly refers to a complete unit consisting of optical fibers, connectors, protective jackets, and...
contact fluid
A liquid, usually of a specific refractive index and dispersion, serving as an interface between two solids to form a...
normal dispersion
Dispersion characterized by an increasing index of refraction in the medium as the frequency of the propagating light...
glass spectrograph
A spectrograph having glass as its refracting component and used in cases where speed and high dispersion are not required....
rainbow hologram
Essentially, a hologram of a hologram, in which the first-generation hologram is masked with a narrow slit. During image...
trochoidal mass spectrometer
A magnetic-deflection mass spectrometer that has an electrostatic field placed perpendicularly to its magnetic field,...
Abbe prism
A form of roof prism used to invert an image. The prism has faces cut normal to the optical axis; therefore, the prism may...
echelle
A grating that serves to provide higher resolution and dispersion than the average grating, and still has a greater free...
dispersion-limited operation
Operation in which the dispersion of a pulse limits the distance between repeaters in optical systems. Waveguide and...
prism
A prism is a transparent optical element with flat, polished surfaces that refract light. It usually has two parallel bases,...
reflection grating
A reflection grating is an optical component that consists of a series of closely spaced, parallel reflecting surfaces or...
crystal quartz
The naturally occurring crystalline form of silicon dioxide. It is slightly birefringent and exhibits rotary dispersion of...
chromatic aberration
Chromatic aberration is an optical phenomenon that occurs when different wavelengths (colors) of light are refracted by a...
dialytic telescope
A telescope that corrects dispersion and spherical aberration through the use of one or more lenses, usually smaller than...
soliton
Any isolated wave that propagates without dispersion of energy. Specifically to photonics, an ultrashort pulse of laser...
material dispersion
The dispersion attributable to the wavelength dependence of the refractive index of the material used in any optical...
modal dispersion
Synonym for multimode distortion. Also called mode dispersion.
Abbe constant
A dispersion relation defined in order to value the reciprocal amount of dispersion. It is defined as the refractivity over...
cross dispersion
Recombination of only the light that is correctly dispersed by the first stage of a polychromator through its wide...
Van der Waals
Van der Waals forces refer to the attractive or repulsive forces between molecules (or parts of molecules) that arise from...
achromat
An achromat, in the context of optics, refers to a type of lens or lens system designed to reduce chromatic aberration....
spectropolarimeter
An instrument for plotting the rotatory dispersion of a substance at different wavelengths.
Christiansen-effect filter
A transparent powdered solid immersed in a liquid or plastic of similar refractive index but widely different dispersion;...
fiber optic spectrometer
A fiber optic spectrometer is a device used for measuring the spectral content of light. It utilizes optical fibers to...
anomalous dispersion
Dispersion that occurs when the medium's index of refraction decreases as the frequency of the propagating light increases....
dispersion-shifted fiber
A dispersion-shifted fiber (DSF) refers to a type of optical fiber designed to minimize the effects of chromatic dispersion,...
dispersion formula
All formulas that present the index of refraction as a function of a wavelength of electromagnetic radiation. Also called...
optical glass
Optical glass refers to a type of glass specifically engineered and manufactured for use in optical components and systems,...
mode dispersion
Synonym (regarded by some as erroneous) for multimode distortion, which see.
entrance slit
The entrance slit, also known simply as the slit, is an essential component in optical instruments such as spectrometers and...
prism chromatic resolving power
The chromatic resolving power of a prism is invariably stated for the case in which parallel rays of light are incident on...
Rayleigh prism
A prism system designed to produce a very high dispersion of light.
dielectric
Exhibiting the characteristic of materials that are electrical insulators or in which an electric field can be sustained...
monochromator
A monochromator is an optical instrument used to isolate and select a narrow range of wavelengths from a broader spectrum of...
flint glass
One of the two major types of optical glass, the other being crown glass. Flint glass is softer than crown glass, has a...
light dispersion
The process whereby white light is separated into its component wavelengths. Light beams of different wavelengths are...
enhanced Faraday effect
The occurrence of very large rotations in transparent materials at weak magnetic fields as predicted in the classical...
optical materials
Optical materials refer to substances or compounds specifically chosen for their optical properties and used in the...
optical testing instrument
An optical testing instrument is a device or system used to evaluate and measure the performance, quality, and...
optical fiber
Optical fiber is a thin, flexible, transparent strand or filament made of glass or plastic used for transmitting light...
waveguide dispersion
For each mode in an optical waveguide, the term used to describe the process by which an electromagnetic signal is distorted...
fluorite
The optical form of the crystal fluorspar, calcium fluoride, that is utilized for its low optical dispersion, its low...
coherent fiber bundle
A coherent fiber bundle (CFB), also known as a coherent fiber optic bundle, is an assembly of multiple optical fibers...
blaze height
Blaze height typically refers to a parameter in the context of diffraction gratings, which are optical devices consisting of...
diffraction grating spectrograph
A spectrograph that uses a diffraction grating as its dispersive element in place of a prism, and yields greater resolving...

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