Search
Menu
Photonics Marketplace
433 terms

Photonics Dictionary: E

Clear All Filters xE x
EDP
electronic data processing
EDR
equivalent direct radiation; effective data rate
EDT
electrodeless discharge tube
EDTA
ethylenediaminetetraacetic acid
EDWA
erbium-doped waveguide amplifier
EDXRF
energy-dispersive x-ray fluorescence
EEC
European Economic Community
EELS
electron-energy-loss spectroscopy
EET
excitation energy transfer
eff
efficiency
effect filter
A color filter, generally used in photography, to emphasize certain color tones and to modify others in a picture for a more dramatic image. A blue effect filter, for example, darkens red and yellow,...
effective f number
For a lens with an obscured or noncircular aperture, the focal length divided by the effective aperture.
effective aperture
1. That portion of the aperture that functions to collect energy and deliver it to the final system detector. 2. For an obscured or noncircular aperture, the equivalent nonobscured, circular aperture.
effective beam
In photoelectric sensing, the portion of the transmitted beam that actually functions in the system; the diameter of the beam that determines the presence or absence of an object by being blocked or...
effective color
The color of an object when it is illuminated by a nonisophotic source.
effective data rate
A characterization of the throughput performance of data storage systems; the EDR is the total of data retrieved divided by the total time it takes to retrieve it, expressed as megabytes per second.
effective focal length -> focal length
The focal length of a lens is the distance between the lens's optical center (or principal point) and the image sensor or film when the lens is focused at infinity. In simple terms, it is the...
effective numerical aperture
The real numerical aperture (NA) of a fiber when the computed NA is not valid because of change in the glass indices during drawing and fusion.
efficiency
As applied to a device or machine, the ratio of total power input to the usable power output of the device.
EFG
edge-defined film-fed growth
EFL
effective focal length; equivalent focal length
EFP
electronic field production
EFPI
extrinsic Fabry-Perot interferometer
EFS
extrafield sensitivity
EFTA
European Free Trade Area
EGA
enhanced graphic adapter
EGD
electrogas dynamics
egg-crating
A weight reducing method whereby material from the rear of a reflector is removed leaving a pattern of ribs normal to the surface in an egg-crate pattern.
EGM
erbium gain module
EHD
electrohydrodynamics
EHF
extremely high frequency
EHP
electron-hole pair
EI
exposure index
EIA
Electronic Industries Alliance
eikonometer
A scale attached to a microscope eyepiece that is seen superimposed on the image and that is used to measure the dimensions of the viewed object.
EIL
electron injection laser
einstein
A unit of energy equal to the amount of energy absorbed by one molecule of material undergoing a photochemical reaction, as determined by the Stark-Einstein law.
Einstein coefficients
Three proportional coefficients labeled Am, Bmn, and Bnm, that respectively characterize the rate of spontaneous emission, induced emission, and absorption of radiation by an atom, ion or molecule.
Einstein shift
A shift in the direction of the red in the spectral lines of light which, defined by the relativity theory, will have decreased frequencies upon emerging from a highly gravitational field.
El
elevation angle
EL
electroluminescent
EL-PC
electroluminescent-photoconductive
elastic scattering
Scattering caused by the interaction between ingoing and outgoing particles of the same type, with no loss of kinetic energy.
elasto-optic effect
A change in the refractive index of an optical fiber caused by variation in the length of the fiber core in response to mechanical stress.
elastomer
Any material of a macromolecular nature that can stretch at room temperature to more than twice its length and return to approximately its original shape when stress is released.
elaterite
The organic inclusion in quartz crystal that forms delicate films and microspheres and that shows a maximum absorption at 450 nm.
elbow telescope
A refracting telescope that uses a prism to bend the line of sight 90°.
ELD
electroluminescent diode
elec
electric
electric arc -> arc discharge
The electric arc that is a particular discharge between two electrodes in a gas or vapor which is characterized by high cathode densities and a low voltage drop.

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.