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8,289 terms
Photonics Dictionary
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deuterated triglycine sulfate
A type of pyroelectric detector with favorable qualities of linearity, sensitivity and spectral responsivity used in FTIR detectors.
deuterium discharge lamp
A discharge lamp filled with deuterium to produce high-intensity ultraviolet radiation for use in spectroscopic analysis.
developer
A chemical solution that changes the silver salts (latent image) of exposed photographic film into black metallic silver (visual image).
devitrification
The process by which a vitreous or amorphous substance forms a crystal structure at a specified temperature.
DEW
directed energy weapon
Dewar vessel
An evacuated, double-walled container for storing liquids at low temperatures. Often made of glass, the vessel resembles a Thermos bottle.
dewetting
Dewetting is a phenomenon in materials science and physics where a thin film or coating spontaneously undergoes a process of breaking up and forming isolated droplets on a substrate. This occurs due...
dextrogyrate
Able to rotate the plane of polarization of a transmitted, plane-polarized light beam clockwise as seen by a viewer looking in the same direction as the traveling light. Also called dextrorotary; the...
DFSM
dispersion-flattened single mode
DFT
discrete Fourier transform
DGaO
Deutsche Gesellschaft für angewandte Optik (German Society for Applied Optics)
DHE
dihematoporphyrin ether
diacaustic
A caustic formed by refraction.
dial
differential absorption lidar
dialyte
An airspaced achromatic doublet telescope objective.
dialytic telescope
A telescope that corrects dispersion and spherical aberration through the use of one or more lenses, usually smaller than the objective lens, that are positioned at a distance from the objective lens.
diamond cutting tool
A tool made by imbedding small particles of diamond in the working edge. In the optical field, the most commonly used diamond tools are glass saws, cup-shaped tools for curve generators, and diamond...
diamond turning
Diamond turning, also known as diamond machining or diamond cutting, is a precision machining process used to produce high-quality optical surfaces and components with extremely tight tolerances. It...
diamond-turned optic
Diamond turning refers to a precision machining process used to produce complex optical components, particularly lenses and mirrors, from materials such as metals, plastics, and crystalline materials...
diamondlike carbon film
A very hard, highly transparent coating based on forms of carbon, used to protect optical components from abrasion and chemical damage.
diaphragm
A flanged or plain ring with a restricted aperture, located in an optical system at any of several points, that cuts off marginal light rays not essential to image formation. Diaphragms are used as...
diaphragm shutter
A shutter consisting of a ring of interweaving blades that open outward and allow light to pass when they are pivoted at their outer edges.
diascope
1. An optical device used for projection of enlarged images of transparencies or lantern slides on a screen. 2. A device designed to hold and backlight transparencies so that their images can be...
diasporometer
In an optical rangefinder, the system of wedges that rotate in opposite directions to aid in the detection of deviation in the image axis.
diathermic mirror
A mirror coated to reflect cold (white) light while transmitting hot (infrared) energy.
diazo film
A type of photographic film, often used in microfilming, that is processed by heat treatment, needing no liquid application.
DIC
differential interference contrast
dichalcogenide
Dichalcogenides are a class of compounds composed of two atoms of a chalcogen element bonded to a single atom of a metal or metalloid element. Chalcogens are the elements in group 16 of the periodic...
dichroic
Exhibiting the quality of dichroism.
dichroic coating
A dichroic coating, also known as a dichroic filter or dichroic mirror, is an optical coating designed to selectively transmit or reflect certain wavelengths of light while simultaneously absorbing...
dichroic mirror
A dichroic mirror, also known as a dichroic beamsplitter or interference filter beamsplitter, is an optical device that selectively reflects or transmits light based on its wavelength. Dichroic...
dichroic polarizer
A polarizer that consists of dichroic polarizing material embedded in a plastic sheet, and that transmits light that is almost completely plane polarized with an intensity that is half that of the...
dichroic ratio
The ratio between two given absorption coefficients.
dichroism
Dichroism refers to the property of certain materials to exhibit different colors or absorbance of light depending on the direction of light propagation or polarization. The term is commonly used in...
dichroscope
A device used to investigate the dichroism of crystals.
dichroscopic eyepiece
An eyepiece used in a polariscope or polarizing microscope to give a comparison view of the same object under illumination by the two complementary rays of polarized light.
DICOM
Digital Imaging and Communications in Medicine
DID
digital information display
didymium glass
Glass tinted with mixed oxides of neodymium and praseodymium that, unlike most solid materials, have absorption bands that are very narrow and that have very sharp areas.
die bonding
Die bonding is a critical process in semiconductor manufacturing and microelectronics assembly, where a semiconductor die or chip is attached and electrically connected to a substrate or a package....
dielectric
Exhibiting the characteristic of materials that are electrical insulators or in which an electric field can be sustained with a minimum dispersion of power. They exhibit nonlinear properties, such as...
dielectric coated grating
A shallow, fine-pitch diffraction grating having a precise dielectric overcoating that experimentally has absorbed wavelength-specific incident light that is polarized in the P-plane.
dielectric coating
A high-reflectance coating consisting of alternating layers of quarter-wave film of a higher refractive index and lower refractive index than the substrate. Such coatings can be made very specific to...
dielectric crystal
A crystal that is characterized by its relatively poor electrical conductance.
dielectric cylindrical waveguide
A waveguide made up of a dielectric material, such as plastic or mica, in a cylindrical form, through which the waves travel.
dielectric filter
->
interference filter
A filter that controls the spectral composition of transmitted energy partially by the effects of interference. Frequently, these filters are made up of thin layers of metals and dielectrics,...
difference threshold
The minimum of change in stimulation needed to effect an awareness of change in sensation that is statistically determined.
differential absorption lidar
A lidar (light detection and ranging) technique used in pollution monitoring. Two light beams are emitted simultaneously, one at a wavelength that will be absorbed by the target particles, and the...
differential interference contrast microscopy
Differential interference contrast (DIC) microscopy, also known as Nomarski interference contrast microscopy, is an optical imaging technique used in microscopy to enhance the contrast of transparent...
differential interferometer
A device that produces an interferogram that can be directly related to the temperature gradient and thereby provides a direct measure of the convective heat transfer coefficients.
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Photonics Dictionary
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