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STED Dictionary Terms

electric CO laser
An electrically excited laser having carbon monoxide as the lasing material and in which lasing occurs in a partial...
zonal aberration
Spherical or chromatic aberration in a lens having a wide aperture. It is present because the refracting power varies for...
servomechanism
A closed-loop system that is constantly adjusted in response to input signals generated within the system.
InGaAs photodiode
An InGaAs photodiode refers to a photodetector device that is constructed using a semiconductor material composed of a...
environmental chamber
A test chamber designed to expose the subject being tested to external conditions, such as heat, shock, pressure and...
variable-focus condenser
An Abbe condenser in which the upper lens element is fixed. The lower lens may focus the illumination between the elements...
plasmon ion-assisted deposition
Plasmon ion-assisted deposition (PIAD) is a technique used in thin-film deposition processes, particularly in the production...
medical lasers
Medical lasers are devices that produce intense beams of light with specific characteristics and properties, which are used...
artificial star
A point source of light used for the test and evaluation of image quality. May be a backlit pinhole in an otherwise opaque...
Kerr effect
The Kerr effect, named after the physicist John Kerr who first observed it in 1875, is a nonlinear optical phenomenon where...
surveyor's level
A small telescope mounted on a tripod and free to rotate about a vertical axis. A spirit level is mounted over the telescope...
liquid mirror
A mirror composed of liquid, taking advantage of the parabolic shape of a spinning liquid and the fact that the mirror's...
gas filter correlation
A technique for measuring the concentration of any gases. Identical infrared beams are alternately chopped, one passing...
radiation trapping
That process by which radiation spontaneously emitted by a volume of optical materials is resonantly reabsorbed within the...
hyperfine splitting
The splitting of an element's spectral line as the result of the interactions between the electron spin and the spins of...
matrix-assisted laser desorption/ionization
Process of analysis in which the analyte substance is distributed in a matrix before laser desorption. This method avoids...
twisted nematic phase
A form of liquid crystal widely used in displays, achieved by sandwiching a liquid crystal material between two substrates...
source
A physical source of radiation, as contrasted to illuminant. See illuminant.
multijunction device
A photovoltaic device that consists of multiple p-n junctions to produce a greater efficiency when in use than that of...
Mohs hardness
Material hardness scale that is used to characterize the scratch resistance of various materials. This surface hardness...
scopometer
A device used to take turbidimetric or nephelometric measurements by considering the contrast between a constant brightness...
supertwisted birefringent effect display
A liquid crystal display using the material in its supertwisted nematic phase; the birefringence of the liquid crystal...
STED microscopy
STED microscopy, or stimulated emission depletion microscopy, is a superresolution imaging technique in fluorescence...
tunable laser
Any form of laser; e.g., a dye laser, having an output that can be adjusted over a wide range of wavelengths. Normally the...
aperture diaphragm
The second adjustable iris diaphragm in an optical system. In the common microscope condenser system, it usually is located...
optical design and engineering services
Optical design and engineering services involve the development, customization, and optimization of optical systems and...
light diffusion
Light diffusion refers to the process by which light is scattered or spread out in various directions as it interacts with a...
reactive evaporation
Reactive evaporation refers to a process in thin-film deposition where a material is deposited onto a substrate through...
superresolution
Superresolution refers to the enhancement or improvement of the spatial resolution beyond the conventional limits imposed by...
tungsten lamp
An evacuated bulb containing a tungsten filament that is heated by passing an electric current through it. In domestic light...
phase matching
Phase matching is a crucial concept in the field of optics, particularly in nonlinear optics and the generation of coherent...
supertwisted nematic phase
A form of liquid crystal in which the 90° twist of the twisted nematic phase has been increased to 180° or more,...
gas-transport laser
A gas laser wherein the gas mixture is not exhausted into the atmosphere but is continually recycled. It is excited in the...
underwater television system
A television system designed to obtain pictures of objects or scenes beneath the surface of the water. Generally, a...
digital signal processing
Digital signal processing (DSP) refers to the manipulation and analysis of signals, which are representations of physical...
Fizeau interferometer
A type of interferometer noted for producing narrow multiple-beam interference fringes. As a result, when compared with the...
diffuser
An optical diffuser is an optical component or material designed to scatter or diffuse light that passes through it. It is...
ground glass
A plate of glass in which a face has been frosted by grinding or etching. It diffuses light by scattering in directions...
lens testing equipment
Lens testing equipment refers to a range of specialized tools and instruments used to evaluate the optical performance,...
Fizeau fringes
Fizeau fringes are interference fringes observed in an interferometer, specifically in a Fizeau interferometer. The Fizeau...
integration time
Integration time, in the context of optics, imaging systems, and sensor technology, refers to the duration over which a...
gallium arsenide phosphide
Gallium arsenide phosphide (GaAsP) is a semiconductor alloy composed of gallium (Ga), arsenic (As), and phosphorus (P). It...
cleared out
Denoting a finished circular edge. A decentered lens is adjusted on a centering chuck so that its image runs true, and the...
lock-in amplifier
A lock-in amplifier is a specialized electronic instrument used to extract and measure small signals embedded in noise or...
color temperature meter
A device containing two photocells behind deep red and blue filters to measure color temperatures. The amplifier gain is...
ion-assisted deposition
A technique for improving the structure density of thin-film coatings by bombarding the growing film with accelerated ions...

(46 results found)

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