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Photonics Dictionary
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ELINT
electronic intelligence
ELIP
electrostatic latent image photography
ELISA
enzyme-linked immunosorbent assay
ellipsometer
A spectrometer equipped with polarizing prisms and retardation plates that is used in the analysis of elliptically polarized light, mostly in the study of thin, evaporated films.
ellipsometry
Ellipsometry is an optical technique used to characterize the properties of thin films and surfaces. It is based on the measurement of changes in the polarization state of light reflected or...
elliptical polarization
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polarization
Polarization refers to the orientation of oscillations in a transverse wave, such as light waves, radio waves, or other electromagnetic waves. In simpler terms, it describes the direction in which...
elliptically polarized light
A light beam whose electric vectors are broken into two elements of unlike amplitudes that are perpendicular to each other and that differ in phase by values other than 1, 3/4, 1/2, 1/4, etc.,...
ellipticity
The quality of asymmetrical intensity distribution in a laser beam, as opposed to a circular distribution.
EM
electron microscope; electromagnetic; electromodulation
EMA
extramural absorption
EMAT
electromagnetic acoustic transducers
embedded laser
The term "embedded laser" typically refers to a laser device that is integrated or embedded into a larger system or structure. In this context, "embedded" implies that the laser is an integral part...
embedded vision
Embedded vision refers to the integration of computer vision technologies into various embedded systems, devices, or machines. Computer vision involves teaching machines to interpret and understand...
embossed hologram
A hologram imprinted on plastic or another medium; e.g., those commonly found on credit cards.
EMC
electromagnetic compatibility
EMCCD
electron multiplying CCD
EMD
equilibrium mode distribution
EME
electromagnetic energy; electromagnetic environment
emergent ray
In optics, the light ray leaving a medium in contrast to the entering or incident ray.
emery
A natural abrasive, produced from corundum in grades ranging from rough to fine, used in the grinding and lapping of glass.
EMI
electromagnetic interference
emission line
The line or lines emitted by an element when its radiation particles travel from one energy level to another.
emission microscope
A type of electron microscope in which the specimen also serves as the cathode source.
emission of sky
Thermal emission caused by the unity in absorption bands that must be discriminated when calculating radiation intensity of any celestial object.
emission spectroscopy
Emission spectroscopy is a technique used to study the emission of electromagnetic radiation (light) by atoms, molecules, or ions when they undergo transitions from excited states to lower energy...
emission spectrum
An emission spectrum is a graphical representation or a characteristic pattern of the wavelengths or frequencies of light emitted by a source, such as an atom, molecule, or celestial object. It shows...
emissive power
The emissivity of a body times the emissive power of a blackbody at the same temperature. For a blackbody, it is the total radiation per unit area of radiating surface.
emissivity
The ratio of an object's radiance to that emitted by a blackbody radiator at the same temperature and at the same wavelength.
emissivity correction matrix
A computer-generated routine for achieving true-temperature readings in thermal infrared imaging systems.
emissometry
The use of a material's emissivity to measure absorption. It is useful as an absorption loss measurement technique, since at thermal equilibrium, emittance is equal to absorptance.
emittance
See emissivity; exitance.
emitter
A source of radiation.
EMMA
electron microscopy and microanalysis
emmetropia
The normal condition of vision where an object at infinity is in sharp focus with the eye lens in a neutral or relaxed state.
EMP
electromagnetic pulse
empty magnification
Magnification that is above the level of maximum useful magnification and does not contribute useful resolving power. In a visual telescope, empty magnification is any in excess of 20 D, where D =...
EMR
electromagnetic radiation
EMRLD
excimer moderate-power Raman shifted laser device
EMU
electromagnetic unit
emulsion
In photography, the layer of light-sensitive material (usually a suspension of silver halide crystals) that coats the film or plate.
emulsion speed
The sensitivity of a photographic emulsion when exposed to light, provided that the film is developed through a standard process.
enantiomer
Enantiomers are a pair of molecules that are non-superimposable mirror images of each other, similar to left and right hands. They are stereoisomers, meaning they have the same molecular formula and...
enclosed arc lamp
An arc lamp whose carbon electrodes are enclosed in a transparent chamber, resulting in an arc that is steadier, lasts longer and emits more ultraviolet radiation.
enclosed laser device
A laser or laser system positioned within an enclosure to prevent dangerous optical radiation from leaving the enclosure.
encoder
->
optical encoder
A device designed to measure linear or rotary motion by detection of the movement of markings on a transparent medium past a fixed point of light. The encoder has a moving code plate, a glass disc...
end-fire coupling
End-fire coupling refers to a method of coupling energy into or out of a waveguide, transmission line, or antenna, where the electromagnetic waves are directed primarily along the axis or direction...
endoscope
An endoscope is a medical device used for visualizing and examining the interior of hollow organs, body cavities, or confined spaces within the body. It consists of a flexible or rigid tube equipped...
endoscopic photography
The photographing of objects within generally inaccessible areas using endoscopes with camera attachments.
energy-sharing laser
A laser that distributes its output power among two, three or four optical fibers simultaneously.
ENG
electronic news gathering
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Photonics Dictionary
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