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8,289 terms
Photonics Dictionary
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ns x
cesium vapor lamp
A lamp that emits light as the result of the passage of an electrical current through ionized cesium vapor.
cesium-antimonide photocathode
A photocathode that exhibits maximum sensitivity in the blue and ultraviolet regions of the spectrum. The sensitivity is obtained by the exposure of a thin layer of antimony to cesium vapor at an...
CEV
controlled environment vault
CFC
chlorofluorocarbons
CFF
critical fusion frequency
CFM
cubic foot per minute
CFR
code of federal regulation
cg
centigram; center of gravity
CGA
color graphics adapter; Compressed Gas Association
CGC
color graphics converter
CGH
computer-generated hologram
CGHOE
computer-generated holographic optical element
CGHS
computer-generated holographic scanner
CGI
Computer Graphics Interface
cgs
centimeter-gram-second
CGVH
computer-generated volume hologram
chain scission
The breakdown of the bonds in polymer chains caused by illumination.
chalnicon
Proprietary name for a low-light-level TV pickup tube.
chamfer
The removal of sharp edges by grinding.
channel electron multiplier
A photoelectric detector consisting of a glass tube internally coated with a low conductance material. Voltage applied along the tube causes photoemission from the photocathode at the end of the tube...
channel impedance
The parallel resistance and capacitance appearing between the active guard ring junctions in a silicon photodiode.
channel substrate planar growth
The creation of a diode laser structure by liquid-phase epitaxy over a grooved substrate.
character generation cathode-ray tube
A cathode-ray tube that generates symbols for use in other displays. The tube operates by scanning specific characters on the target and generating them as video signals to other cathode-ray systems.
character generator
Computer hardware or firmware that accesses character patterns stored in read-only memory and displays them at specific coordinates on a screen.
character read-out system
A photoelectrically controlled, alphanumeric reading device that converts characters to audible or sorting signals which can be fed to a computer, electric typewriter, tapepunch or other machine.
characteristic angle
The angle at which a given mode propagates down an optical fiber.
characteristic curve
A graph used in photography to portray the increase of a film's density as its time of exposure increases.
charge packet
->
packet
The finite amount of electrical charge generated in response to incident radiation and transferred from one storage element to the next in a charge-coupled device. Each packet corresponds to a pixel...
charge trapping
In a charge-coupled device, the disappearance of some of the accumulated charge into the silicon during readout.
charge-coupled device
A charge-coupled device (CCD) is a type of electronic image sensor used in various imaging devices, including digital cameras, camcorders, and scientific instruments. It consists of an integrated...
charge-injection device
A charge-injection device (CID) refers to a class of devices that manipulate and detect electrical charge within a semiconductor material. Charge-coupled devices are a specific implementation of this...
chelate laser
A laser having a rare-earth chelate within a plastic host as the lasing material. The chelate laser is easily pumped and has a high quantum efficiency and narrow emission lines.
chelating agent
Any of several compounds capable of binding heavy-metal ions, thereby preventing interaction between the bound ions and the rest of the medium.
chemical actinometer
A light-sensitive detector having a chemical compound that reacts when exposed to light. It is used in photochemistry and relies on the chemical reaction to determine the amount of incident radiation.
chemical laser
A laser that relies on chemical activity instead of electrical energy to produce the pumping action necessary to form pulses of light.
chemical microscopy
The field of microscopy as applied to chemical problems and analysis.
chemical vapor deposition equipment
Chemical vapor deposition (CVD) equipment refers to a class of specialized apparatus used in the process of chemical vapor deposition, a technique for depositing thin films of various materials onto...
chemical-mechanical polishing
A technique for polishing silicon in which an alkaline suspension containing silicon dioxide particles creates a soft layer of silicon hydroxide, which is then removed, leaving a surface with the...
chemiluminescence
A chemical reaction involving the production of light. The reaction of ethylene with ozone is chemiluminescent.
chemisorption
The binding of gas to a surface or in matter by chemical activity.
chemosphere
Also known as mesosphere. A level of the atmosphere, extending from the stratosphere to the ionosphere, that is noted for its photochemical activity.
chief ray
The ray that passes through the center of the aperture stop in an optical system. It often is called the principal ray of an oblique beam.
chip
1. A localized fracture at the end of a cleaved optical fiber or on a glass surface. 2. An integrated circuit.
CHIP
chain input pointing
chip-on-board lights
Chip-on-board (COB) lights refer to a type of LED lighting technology where multiple LED chips are directly mounted onto a substrate, typically a printed circuit board (PCB), without the need for...
chipping
->
cribbing
The breaking of the excess glass from the specified shape.
chiral
Description of a particle that cannot be superimposed on its mirror image.
chirality
Chirality is a property of certain molecules and objects in which they are non-superimposable on their mirror images. In other words, a chiral object or molecule cannot be exactly superimposed onto...
chirped mirrors
Chirped mirrors are optical devices designed to manipulate the spectral properties of ultrashort laser pulses. They consist of multiple layers of dielectric coatings deposited on a substrate, where...
chirped-pulse amplification laser
A laser whose pulses are expanded, using gratings and optical fibers, before amplification and compressed to increase beam intensity without damage to the optical train.
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Photonics Dictionary
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