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8,236 terms
Photonics Dictionary
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cos
-1
inverse cosine
cosh
hyperbolic cosine
cosine collector
Translucent collector developed to compensate for the partial blocking of a flat surface's collection angle that normally occurs in spectroradiometry. The device samples radiant flux according to the...
cosine emission law
->
Lambert's cosine law
Flux per unit solid angle leaving a surface in any direction is proportional to the cosine of the angle between that direction and the normal to the surface. A material that obeys Lambert's cosine...
cosine fourth law
A formula indicating that, for an imaging lens system, the image brightness for off-axis points will fall off at a rate proportional to the cos4 of the off-axis field angle.
cosine law of illumination
Law relating the illuminance (or irradiance) of a surface to the cosine of the angle, q, between the normal to the surface and the direction of the incident wave.
cosmetic defect
->
beauty defect
A defect on or in an optical element that does not appreciably impair the function of the surface.
cosmic expansion
The ongoing expansion of the universe based on observations of the recession of distant galaxies from each other as evidenced by the redshift in their spectral lines.
cosmic ray telescope
A system consisting of two or more Geiger-Müller counters, connected in coincidence with their centers on an axis. The only particles recorded are those traversing all counters, near the axis,...
COSY
correlated spectroscopy
cot
cotangent
coth
hyperbolic cotangent
COTS
commercial off the shelf
Cotton-Mouton constant
Relative to the Cotton-Mouton effect, the magnetic birefringence constant that, when multiplied by pathlength and the square of the magnetic field strength, yields the phase difference between the...
Cotton-Mouton effect
The ability of particular pure liquids to doubly refract when influenced by a magnetic field with a direction that is transverse to the light beam.
coudé
A set of mirrors along a telescope's polar axis designed to redirect light to a fixed position without being affected by the motion or position of the telescope. From the French word for "elbow."
Coulomb damping
Conversion of vibratory energy into heat that is observed in the rubbing of two dry surfaces over each other.
Coulomb scattering
The scattering of charged particles, moving through matter, by the electrostatic force exerted by other charged particles.
coulomb
The quantity (C) of electricity transported in one second by a current of one ampere.
coumarin 314T
An efficient, readily soluble blue-green laser dye.
countersink
The concave portion of a surface, formed on a blank, on which the disk of higher refractive glass will be fused to form a multifocal spectacle lens.
counting chamber
In microscopy, the chamber that is contained on a microscope slide to hold a certain amount of fluid. It is calibrated accurately to determine the number of cells and other elements while the...
coupled rangefinder
A rangefinder on a camera that is integrated with the focusing mechanism so that when an object's range is determined, the camera is automatically in focus.
coupler
1. In color development, the chemical that combines with certain by-products of the development procedure to form a dye. 2. Device for distributing optical power among two or more ports. 3. Device...
coupling efficiency
The fraction of available output from a radiant source that is coupled and transmitted by an optical fiber.
COV
coefficient of variation
covalent crystal
A crystal formed by covalent bonds that are generally highly directional by nature. The electric characteristics of these crystals classify them as semiconductors.
covered groove
A technique used in integrated optics where a groove is cut on a substrate surface and covered by a thin film to facilitate the construction of filters, resonators, beamsplitters and grating couplers...
coverslip
A coverslip, also known as a cover glass or cover slip, is a thin and flat piece of transparent material typically made of glass or plastic. It is used in microscopy to cover a specimen mounted on a...
cp
candlepower
cP
centipoise
CPC
compound parabolic concentrator
CPH
computer polarization holography
CPI
common path interferometry
CPM
colliding pulse mode
CPS
cathode potential stabilization
cps
cycles per second
CPU
central processing unit
CPV
concentrator photovoltaic
CR
cathode ray; command register; control relay; coupling ratio; crystal rectifier
CRADA
cooperative research and development agreement
Craik-O'Brien effect
Observed when alterations in the luminous sterance at the contour of an object create the illusion of the outer zones appearing darker than the inner regions, despite the consistent luminance of the...
crater lamp
A glow-discharge tube in which the discharge takes place in the conical or crater-shaped depression at one end of the tube.
Crayford focuser
A high-quality focuser that uses rollers rather than gears and offers smooth, precise motion while reducing or eliminating image shift and backlash.
CRD
capacitor resistor diode
CRDF
cathode-ray direction finding
creep
The deformation of a material at high levels of stress, often associated with elevated temperatures.
cresyl violet
Cresyl violet, also known as cresyl violet acetate or cresyl echt violet, is a synthetic organic compound belonging to the class of triarylmethane dyes. It is commonly used in histology and...
CRI
color rendering index
cribbing
The breaking of the excess glass from the specified shape.
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Photonics Dictionary
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