Search
Menu
Photonics Marketplace
433 terms

Photonics Dictionary: E

Clear All Filters xE x
e
electron charge
E
exa-
e-beam
electron beam
E-bend
In a waveguide, a change in direction of the axis without deviating from the plane of polarization.
E-O
electro-optic
EAF
electron-arc furnace
EALM
electronic address light modulator
EAM
electro-absorption modulator
EAP
electro-absorption avalanche photodiode
EBAM
electron-beam accessed memory
EBC
electron-beam coating
EBCM
extended boundary condition method
EBER
electron-beam electroreflectance
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.
EBES
electron-beam-exposure system
EBIC
electron-beam-induced current
EBIR
electron bombardment-induced response
EBR
electron-beam recording
EBT
electron-beam tomography
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.
eccentricity
In the tolerancing of optical elements, the displacement of the optical axis from the mechanical axis.
ECDC
electrochemical diffused collector
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...
ECL
emitter-coupled logic; external cavity laser
ECM
electronic countermeasure
ECMA
European Computer Manufacturers' Association
ECO
electron-coupled oscillator
ECPR
electrically calibrated pyroelectric radiometer
ECR
electron cyclotron resonance
ED
extralow dispersion
EDC
error detection code
EDD
electronic data display
EDFA
erbium-doped fiber amplifier
edge
The flat or angled surface, usually fine-ground, that limits the aperture of a lens or prism surface.
edge contrast -> acutance
In photography, the density gradient across an edge separating light from darkness, a physically measurable quantity that correlates well with subjectively observed sharpness of definition. By...
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.
edge-defined film-fed growth
Process for growth of solar cells that results in rectangular shapes consisting of many interconnected cells in a series or series-parallel arrangement. EFG cells show increased efficiency with...
edge-emitting LED
An edge-emitting light-emitting diode is a type of LED structure where light emission occurs primarily along the edge of the semiconductor chip rather than from the surface. Edge-emitting LEDs are...
edging
The finishing of the edge of an optical element by grinding.
EDM
electron discharge machining

Photonics DictionaryE

We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.