Excelitas Technologies Corp. - X-Cite Vitae LB 11/24

Photonics Marketplace

Suppliers Products

Handbook Institutions Dictionary

Show Filters

Hide Filters

Type

DefinitionsAbbreviations/Acronyms

Browse by Letter

Ohara Corp. - Optical Glass, Polish substrates 10-23

PI Physik Instrumente - Microscope Stages HP ROS 11/24

8,726 terms

Photonics Dictionary

EQE

equivalent quantum efficiency

equal-energy source

A light source that produces an equal-energy spectrum.

equal-energy spectrum

Spectrum characterized by equal energy (power, flux) per unit wavelength interval.

equal-energy white

A stimulus that contains equal energy at each wavelength in the visible region of the spectrum.

equalized-response densitometer

A densitometer having a receiver that indicates when a desired radiation level has been attained.

equatorial mount

A telescope stand equipped with a polar axis that can be set parallel to the Earth's axis of rotation and a declination axis that is at right angles to the polar axis. If the telescope is turned at a...

equatorial telescope

A telescope that is mounted on an equatorial mount.

equidensities

1. A contour map of a photographic deposit consisting of lines and curves that join points of equal density. 2. The portrayal of a photograph's points of equal density in hues of yellow, cyan and...

equidensitometry

1. The use of an electronic microdensitometer to measure points of equal density on a photographic deposit. 2. A technique that simplifies a picture's density pattern by making a single isodensity...

equilibrium length

The length of optical waveguide needed to attain equilibrium mode distribution for a specified excitation condition.

equilibrium mode distribution

The condition in a multimode optical waveguide in which the relative power distribution among the propagating modes is independent of length.

equiluminous colors

Colors differing only in chromaticity but not in luminance.

equivalency width

Calculation of the amount of energy extracted from a light beam regardless of its wide range resolution.

equivalent air path

When a block of glass (prism, window, filter, etc.) is placed into a converging light bundle, it increases the physical distance to the point of focus. The equivalent air path for that block of glass...

equivalent 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...

equivalent wavelength

In surface height measurement of optics with steep slopes, the use of two short visible wavelengths to synthesize a longer, equivalent wavelength.

Er:YAG laser

An Er:YAG laser is a type of solid-state laser that uses a crystal made of erbium-doped yttrium aluminum garnet (Er:Y3Al5O12) as the gain medium. The erbium (Er) ions are introduced into the crystal...

ERA

earth radiation array

erasable

Data or encoded information capable of being eradicated, leaving the media free for rewriting. Also called reversible.

erbium-doped fiber amplifier

An optical fiber that can be used to amplify an optical input. Erbium rare earth ions are added to the fiber core material as a dopant in typical levels of a few hundred parts per million. The fiber...

erbium-doped fiber laser

An erbium-doped fiber laser (EDFL) is a type of laser that uses an optical fiber doped with erbium ions (Er³+) as the gain medium. These lasers are widely used in telecommunications, medical...

ERCR

electronic retina computing reader

erect image

An image, real or virtual, whose spatial orientation is identical to that of the object. The image obtained at the retina with the assistance of an optical system is said to be erect when the...

erecting eyepiece

An eyepiece combined with an erecting prism or lens system.

erecting system

Lenses or prisms that serve to erect the image; i.e., to bring the image upright after it has been inverted by the objective.

Erfle eyepiece

A telescopic eyepiece comprising five or six simple lenses in the form of three doublets or two doublets and a singlet.

ERG

electroretinography

erosion

In image processing, a morphology operator in which a structuring element or probe of a particular shape is moved over the input image. Where the probe fits completely within the boundaries of a...

ERP

effective radiated power

error correcting code

The addition to the information signal in communications of redundant bits that enable the originally encoded message to be decoded without degradation of the data. In compact disc technology, the...

error function

A single number, defined by the computer program or the user that expresses the performance of an optical system. Also known as merit function and defect function, the error function comprises...

ERTS

earth resources technology satellite

erythema

Localized redness of skin due to congestion of capillaries; a common result of overexposure to laser radiation.

ESA

European Space Agency; excited state absorption

ESCA

electron spectroscopy for chemical analysis

ESD

electrostatic discharge

ESF

extended superframe format

ESPI

electron speckle pattern interferometry

ESPRIT

European Strategic Programme for Research in Information Technology

ESR

electrical substitution radiometer; electron spin resonance

ESSA

environmental survey satellite

ESTM

electron scanning tunneling microscope

esu

electrostatic unit

ephemeris time

etalon

An etalon is an optical device that consists of two parallel reflecting surfaces separated by a precise and known distance. It operates based on the principle of optical interference and is used to...

etaloning

Etaloning is an optical phenomenon that occurs in imaging systems, particularly in devices such as spectrometers, interferometers, and cameras. It is characterized by the appearance of interference...

etching

The engraving of a surface by acid, acid fumes or a tool; a process extensively used in the manufacture of reticles.

etching liquid

An acid used to etch the surfaces of particular materials. For glass, hydrofluoric acid is used either as a liquid or a vapor. Metals are etched by means of suitable acids or other liquids, often to...

ETD

edge thickness difference

etendue

A product of the area of a light beam (normal to its direction of propagation) and the solid angle that the beam includes; flux per unit radiance or luminance. Alternative terms: geometric extent,...

Photonics Dictionary

Need Help?

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.