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8 terms
Photonics Dictionary: G
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Grashof number
Formula used in convection study to express the ratio of buoyant force to viscous force.
gain
Also known as amplification. 1. The increase in a signal that is transmitted from one point to another through an amplifier. A material that exhibits gain rather than absorption, at certain...
gallium arsenide phosphide
Gallium arsenide phosphide (GaAsP) is a semiconductor alloy composed of gallium (Ga), arsenic (As), and phosphorus (P). It is commonly used in the fabrication of optoelectronic devices, particularly...
galvo-directing mirrors
A system of mirrors that can be used to direct light from a single laser source into any one of a number of separate optical fibers.
getter
In vacuum deposition, a device that removes contaminants from the vacuum chamber.
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...
grating
A framework or latticework having an even arrangement of rods, or any other long narrow objects with interstices between them, used to disperse light or other radiation by interference between wave...
Grittington test
A method of determining the abrasion resistance of very hard materials by passing a weighted wiper blade across them in a sand-water slurry for a specified number of times.
Photonics Dictionary
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