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

AdTech Ceramics - Ceramic Packages 1-24 HP

8,726 terms

Photonics Dictionary

glass

A noncrystalline, inorganic mixture of various metallic oxides fused by heating with glassifiers such as silica, or boric or phosphoric oxides. Common window or bottle glass is a mixture of soda,...

glass annealing furnace

A furnace, generally electrically heated, with a control system capable of following a cam by which the temperature can be made to go through a definite cycle over a period of days, or even weeks, if...

glass barium

A type of glass containing barium oxide, which is added to increase the refractive index while maintaining a relatively low dispersion.

glass capacitor

A capacitor that uses glass as its dielectric material.

glass dosimeter

A device that detects and measures the quantity of exposure to nuclear radiation. It uses a special glass rod that fluoresces when placed under ultraviolet radiation after its exposure to nuclear...

glass film plates

An early form of photographic media consisting of glass plates coated with an emulsion.

glass laser

An optically pumped solid-state laser in which the active medium is a neodymium ion in a glass rod host. Abbreviated Nd:glass.

glass marking ink

Ink used for writing on glass, and also for blackening the edges of lenses to prevent reflection. In the latter case, the refractive index of the ink must closely match that of the glass.

glass spectrograph

A spectrograph having glass as its refracting component and used in cases where speed and high dispersion are not required. The glass material has a range of about 3700 to 8000 Å.

glass-ceramic

A type of glass used in telescope mirrors, formed by adding a nucleating agent to standard glass and then heating it until it crystallizes.

glass-melting furnace

A furnace used to heat glass materials. It may be a small laboratory-type furnace for small-scale experiments or large enough to hold gas-fired tanks for the commercial mass production of glass....

glazing

The process whereby a spectacle lens is placed in a frame.

glide plane

The plane shared by the pair of axes in a twin crystal.

glitter

The specular reflection of individual parts of a surface.

global optimization

A controlled random search process, such as generalized simulated annealing, that has been incorporated into many optical design programs as a way of helping designers find the most suitable lens...

global radiation

The total radiation, both solar and diffuse sky, that is incident to a unit's horizontal surface.

globar

A light source made up of silicon carbide or carborundum. It is resistant to the negative temperature coefficient and mechanical distortion.

globulite

A crystal of microscopic size having no definite plane faces and having a globular shape. At the time the crystal is formed, the strong surface tension influences the formation of the plane faces.

gloss

Property of a surface which, because of directional reflection, is responsible for the degree to which reflected highlights or the images of objects may be seen as superimposed on the surface.

glossmeter

A photometer for measuring gloss by comparing the specular reflectance to that from a perfect specular reflector.

glow discharge

An electric discharge in a low-pressure gas having a low-current density and a space potential near the cathode that is much higher than the ionization potential of the gas but less than its sparking...

glow lamp

A lamp in which the ionization of the inert gas contained in it produces a glow in the space close to the negative electrode.

gmol

gram mole

GMT

Greenwich Mean Time

GMTF

geometric modulation transfer function

GOES

geostationary operational environmental satellite

GOI

gate oxide integrity

Golay cell

A thermal radiation detector consisting of a small cell with a blackened plastic front face that bulges slightly when heat is received by it. The bulging tilts a small mirror, which, in turn, varies...

gold colloid aggregates

Gold colloid aggregates refer to clusters or assemblies of gold nanoparticles suspended in a liquid medium. These aggregates are formed when individual gold nanoparticles come together due to various...

gold vapor laser -> metal vapor laser

Devices in which the lasing medium is a vapor of metal atoms or ions, sometimes mixed with another gas. Metal vapor lasers use a variety of metal types to generate a variety of laser lines for...

Goldberg wedge

A neutral-colored gelatin wedge, cast between glass plates, that is used as an intensity scale in certain types of sensitometers; the greater the thickness of the wedge through which light emitted by...

Golgi Staining Technique

The Golgi staining technique (also called the black reaction) makes it possible to look at the nervous system by rendering neurons visible under light microscopy. After a long process involving...

GOME

global ozone-monitoring experiment

goniometer

A spectrometer or autocollimator used to measure prism angles.

goniometer eyepiece

An eyepiece having a rotating index or cross wire linked to an external 360° scale to allow measuring of angles in an image.

goniophotometer

A device used to measure directional reflectance, with light collection restricted to a narrow range of angles of which the central angle varies.

goniophotometric curve

The graphed curve illustrating the directional reflectance of a sample for different angles of collection.

Gordon-Haus effect

Temporal jitter at a signal's receiver when amplified noise causes frequency shifts, as with a soliton traveling through an erbium-doped fiber amplifier.

GORID

ground optical recorder for intercept determination

GOSIP

government open systems interconnection profile

GPC

graphics performance characterization

GPIB

general-purpose interface bus

GPON

Gigabit passive optical network

GPS

global positioning system

graded index

Descriptive of an optical fiber having a core refractive index that decreases almost parabolically and radially outward toward the cladding. This type of fiber combines high bandwidth with moderately...

graded reflectivity mirror

A mirror whose percent reflectance varies as a function of position on the mirror surface.

gradient

In image processing and machine vision, the rate of change of pixel intensity.

gradient edge enhancement

Edge enhancement with a directional characteristic.

gradient vector

In an image, the orientation and magnitude of the rate of change in intensity at any point.

gradient-index profile

The term gradient-index profile refers to a specific type of refractive index distribution within an optical material. In optics, the refractive index of a material describes how much the speed of...

Photonics Dictionary

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