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5,268 terms
Photonics Dictionary
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DSF
dispersion-shifted fiber
DTIC
Defense Technical Information Center
dual attachment station
In a dual-ring local area network, a node that is connected both to the primary, active ring and also to a secondary ring that provides redundancy in case of cable or system failure.
dual-axis laser
Dual-axis laser is a laser device or system capable of emitting laser beams along two orthogonal axes (typically X and Y axes) concurrently. This allows for precise control and manipulation of the...
dual-chirped optical parametric amplification
Dual-chirped optical parametric amplification (DC-OPA) is an advanced technique in ultrafast laser technology used to amplify femtosecond laser pulses to extremely high energies while maintaining...
dual-wavelength spectrophotometry
Spectrophotometry in which radiation of two separate wavelengths, usually one in an absorption band and the other not, pass through the specimen. The resulting data allows correction for attenuation...
ductility
A material's ability to undergo plastic deformation, specifically elongation, without fracturing.
ducting
Propagation of electromagnetic waves through the Earth's atmosphere in a path that conforms to the curvature of the Earth due to atmospheric thermal inversion. Regions of the atmosphere act as a...
duplet lens system
An optical system having two sets of components separated by an air space, while successive lenses in each set are cemented together.
duplex
In data communications, the simultaneous operation of a circuit in both directions is known as full duplex; if only one transmitter can send at a time, the system is called half duplex.
dust extinction
In atmospheric optics, the almost total blocking of light transmission in the atmosphere due to the scattering and absorption of the light by dust particles.
duty cycle
Also duty factor, duty ratio. The product of the pulse duration and the pulse repetition frequency of a wave composed of pulses that occur at regular intervals.
DVDR
direct-view diagnostic region
DVI
digital video interaction
DWDM
dense wavelength division multiplexing
dwell time
For a detector, the amount of time alotted for the observation of one location.
dye
->
laser dye
Class of organic dyes that emit coherent radiation over a wide spectral range.
dye laser
A laser using a dye solution as its active medium. Its output is a short pulse of broad spectral content and its achievable gain is high. Dye lasers function at room temperature. Synchronous pumping...
dye-polymer optical disc
A type of erasable data storage device that uses a medium deposited on the disc in two layers, each dyed to absorb a different wavelength of laser light. To record data, the lower layer is heated by...
dynamic beam correction
The superimposition of a pilot object on each hologram. The fixed relative position of the scanning and pilot beam during the recording process ensures that sensing and fixing the pilot beam position...
dynamic light scattering spectroscopy
->
photon correlation spectroscopy
Spectroscopy used to study the concentration, diffusion and Brownian motion of small particles suspended in a fluid by measuring dynamic fluctuations of light that is scattered or fluoresced by the...
dynamic magneto-optical correlator
An optical correlator incorporating a binary phase-only spatial light modulator made from an iron garnet magneto-optic solid crystal and used in target recognition systems.
dynamic spectroscopy
A spectroscopic technique used to display the intensity of an optical pulse as functions of time and frequency simultaneously.
dynamic stare sensor
A type of mosaic detector array that combines features of scanning and staring sensors by using a small rapid scanning motion (see saccadic motion) over a few pixels at a time.
dynamic theory
The theoretical explanation and analysis of the interactions between electron waves and crystals used in studying electron diffraction.
dynamic variation
In electrical equipment, power variations that are temporary (as opposed to the permanent, cumulative effects of drift).
dynode
The auxiliary electrode in a photomultiplier that gives rise to secondary emission and amplification when bombarded by photoelectrons.
E-bend
In a waveguide, a change in direction of the axis without deviating from the plane of polarization.
EAM
electro-absorption modulator
EAP
electro-absorption avalanche photodiode
EBCM
extended boundary condition method
Eberhard effect
Observed phenomenon of a small developed image with higher density than a larger image because of variation in photographic plate densities with variations in size of opening.
EC
electrically conducting; European Commission
ECC
error correction code; electronically controlled coupling
eccentric mounting
A lens mounting with eccentric rings that may be rotated to shift the axis of the lens to a prescribed position.
echelette grating
A diffraction grating with lines and grooves formed so as to concentrate the radiation of a particular wavelength into one specified order. This device is efficient when used in the infrared region...
echelle
A grating that serves to provide higher resolution and dispersion than the average grating, and still has a greater free spectral range than either the Fabry-Perot etalon or the reflection echelon.
echelle grating
A specialized form of diffraction grating consisting of assembled glass plates of equal thickness that resemble a flight of stairs. The light enters through the largest plate at the end and emerges...
ECMA
European Computer Manufacturers' Association
ED
extralow dispersion
EDC
error detection code
edge AI
Edge AI, also known as edge artificial intelligence, refers to the deployment of artificial intelligence (AI) algorithms and models directly on edge devices, such as smartphones, sensors, IoT...
edge contrast
->
acutance
Acutance refers to the perceived sharpness of an image in terms of the contrast of edges, rather than the resolution of fine details. It relates to how well-defined and crisp edges appear in a...
edge detection
In image processing, the location of edges by employing templates that respond to the first or second derivative of gray-scale intensity in the neighborhood of each pixel.
edge enhancement
In image processing, any operation that strengthens information about the edges of objects displayed. Three types of spatial filtering are used: shift and difference, gradient and Laplacian.
edge filter
->
bandpass filter
A filter with a transmission that is high for a particular band of frequencies, but that falls to low values above and below this band.
edge following
In image processing, a segmentation algorithm for isolating a region in an image by following its edge.
edge response
Intensity distribution in the image of an edge. The gradient of the edge-response curve is a measure of the image quality of the optical system under test.
edge sensing, second derivative
Technique for the precision evaluation of coincidence of a laser beam's center with the edge of the object under study and exact location of that edge by means of a double electronic differentiation...
edge thickness difference
The maximum variation in thickness of a lens as measured around a diameter centered on the optical axis. The ETD divided by that diameter yields the wedge of the lens.
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Photonics Dictionary
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