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Lambda Research Optics, Inc. - Custom Optics

AdTech Ceramics - Ceramic Packages 1-24 HP

8,726 terms

Photonics Dictionary

false color process

Entirely analogous to color photography, but inclusive of light bands that do not appear in the visible spectrum.

fan

A set of rays through a lens originating at a common point and contained in one plane.

fan-in

The simultaneous collection of two or more signals at a single location. In a digital computer, it refers to the number of inputs that can be accommodated by a particular logic circuit.

fan-out

The distribution of one signal to more than one location. In a digital computer, it refers to the number of outputs that can be fed by a particular logic circuit.

FAP

calcium fluorophosphate

FAR

Federal Acquisition Regulation; false alarm rate

far point (of vision)

The object distance at which the eye is focused with the eye lens in a neutral or relaxed state.

far-field diffraction pattern

The diffraction pattern of a source such as a light-emitting diode, injection laser diode or the output end of an optical waveguide observed at an infinite distance from the source.

far-field region

A region far from an aperture or source where the diffraction pattern is essentially the same as that at infinity. Changes in diffraction patterns of points within the far-field region are...

far-infrared grating

A grating with very coarse rulings to match the long wavelengths in the far-infrared region. In the most efficient ruling method, grooves are cut in plane, solid aluminum alloy blanks.

far-infrared laser

A laser with output over a wide range of wavelengths spanning the far-infrared region of the spectrum (30 to 1000 µm); typically, it consists of a metal or dielectric waveguide one to two...

far-infrared maser

A gas maser that is capable of producing radiation in the far-infrared region of the spectrum.

far-infrared

That part of the infrared spectrum from about 30 to 1000 µm.

far-ultraviolet radiation

That radiation characterized by wavelengths ranging from 0.2 to 0.3 µm in the electromagnetic spectrum.

farad

The capacitance of a capacitor which has a potential difference of one volt between its plates when it is charged by one coulomb of electricity.

Faraday configuration

Describes incident radiation propagating parallel to an externally applied magnetic field in magneto-optical experimentation.

Faraday constant

The product of Avogadro's constant and the electrical charge of an electron; thus, the electrical charge carried by 1 gmol of a substance, or approximately 9.65 x 104 C.

Faraday dark space

The nonluminous area that divides the negative glow from the positive column in a Crookes tube under conditions of moderate pressure.

Faraday effect

The Faraday effect, named after the English scientist Michael Faraday, is a phenomenon in physics where the polarization plane of light is rotated when the light passes through a transparent medium...

farbe -> color center

A color center, in the context of materials science and condensed matter physics, refers to a specific type of crystallographic defect in a crystalline structure that introduces color to the...

Farnsworth-Munsell test -> color perception test equipment

Equipment for testing an observer's color vision. Some tests require the identification or ordering of colored samples. The commercially available examples include: the Ishihara plates, on which...

FASE

fast advanced spin echo

fast axis

In a birefringent material, the index of refraction varies with the direction of vibration of a lightwave. That direction having a low refractive index is the fast axis; at right angles to it is the...

fast axis collimation lens

A FAC lens, or fast axis collimation lens, is an optical component used in laser diode systems to collimate the fast axis of laser emission. Laser diodes emit light in two main axes: the fast axis,...

fast Fourier transform -> Fourier transform

Any of the various methods of decomposing a signal into a set of coefficients of orthogonal waveforms (trigonometric functions).

FASTAR

frequency angle scanning, tracking and ranging

fata morgana

A type of mirage that creates a distorted vertical image of relatively flat objects so that they appear as mountains, cliffs, columns or castles. The nonexistent mountainous region in the Arctic...

fatigue

The decrease of a component's efficiency, or a reduction in a material's light sensitivity, as the result of accumulated exposures to radiant energy.

fax -> facsimile

The reproduction of a picture or image, produced by scanning the image and converting it into electrical signals that carry the image to be reproduced. Also known as fax.

FBG

fiber Bragg grating

FBL

fly by light

FBW

fly by wire

footcandle

FC connector

The fiber optic connector standard for Nippon Telephone & Telegraph (NTT) installations, developed with Nippon Electric Co. (NEC).

FCC

Federal Communications Commission

FCH

Fourier color hologram

FCS

fluorescence correlation spectroscopy

FCT

fast cosine transform

full duplex

FDDI

fiber distributed data interface

FDDN

fiber data distribution network

FDHM

full duration half maximum

FDM

frequency division multiplex

FDR

frequency domain reflectometry

FDTD

finite difference time domain

FEA

finite element analysis

feather

A featherlike flaw in a body of glass.

feature extraction

In image processing and machine vision, the process in which an initial measurement pattern or some subsequence of measurement patterns is transformed to a new pattern feature. In image pattern...

FEC

forward error correction

Fechner ratio

The differential luminance threshold divided by the luminance.

Photonics Dictionary

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