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8,289 terms
Photonics Dictionary
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ns x
buckyballs
->
fullerenes
Molecules composed entirely of carbon, in the form of a hollow sphere, ellipsoid or tube. Also called buckyballs. Cylindrical fullerenes are called carbon nanotubes or buckytubes.
BUF
beam utilization factor
buffer
1. In fiber optics, a protective material applied as an optical fiber cover that has no optical function. 2. In image processing, a peripheral that stores data between two active processing stages.
bulk acoustic wave
A sound wave that travels through a piezoelectric material.
bulk nonreciprocal device
A device that functions throughout the continuous radiation of a linearly polarized plane wave, and whose nonreciprocity arises from the Faraday rotation of linearly polarized radiation.
bulk scattering
The scattering of light within a medium.
bump-forming optical disk
->
dye-polymer optical disc
A type of erasable data storage device that uses a medium deposited on the disc in two layers, each dyed to absorb a different wavelength of laser light. To record data, the lower layer is heated by...
bundle
A conical or cylindrical package of light rays emanating from a common point on the object.
burn
A surface imperfection caused by a polisher running dry too long. It occurs with felt or plastic polishers, and may appear as a reddish brown.
burn-in
The operation of a laser diode or other component prior to its use in its intended application, as a means of testing and stabilizing it.
burn-through
A detector's ability to sense an object on the opposite side of a thin but opaque barrier such as cardboard.
burning glass
A convex lens that brings an incident bundle of rays to a focus to produce intense heat at the focus.
burnishing
The process of lapping a thin edge of metal over the bevelled edge of a lens to maintain it within its cell.
burst mode laser
A high-frequency pulse-rate laser with an output limited by the heat capacity of the laser medium. Instead of having continuous cooling, the laser operates until the medium reaches a maximum...
burst pressure
The measure used in vacuum technology to quantify the total pressure capacity of the ferrofluidic seal before it fails.
bus
A local area network topology in which all nodes are tapped off a single cable, and all hear every transmission on the cable.
Butterworth filter
An electric filter that is characterized by a passband of the flattest possible shape.
button
A piece of glass with a high refractive index that is fused to the major blank.
button blocking
The production of a block by attaching the optical elements to a plate by means of individual buttons of pitch or other thermoplastic material.
BW
bandwidth
BWDM
birefringent wavelength division multiplexing
BXA
Bureau of Export Control
byte
The number of bits used to represent a character.
c
centi-; speed of light in a vacuum
c to c
center to center
C-band
conventional band
C-mount
A standard lens interface initially made for 16mm movie cameras and now used primarily on closed-circuit television cameras. It is a 1-in.-diameter, 32-thread-per-inch interface with a...
C/AHARS
compass/attitude heading and reference system
cable
->
fiber optic cable
A package for an optical fiber or fibers that may include cladding, buffering, strength members and an outer jacket.
cache
A portion of computer memory that is used for temporary storage of frequently accessed data. Substantially increases computer speed.
CAD
computer-aided design
CADE
computer-assisted data entry
CADF
cathode-ray tube automatic direction finding
cadmium lamp
A mercury vapor discharge lamp that has cadmium added to emit radiation in the red region as a complement to the mercury vapor's blue and green radiation.
cadmium lines
The three lines in the spectrum of cadmium that have the purest radiations and that were first used by Michelson to calculate the standard meter.
cadmium red line
The narrowest line of the cadmium spectrum; the red line has the purest radiation.
cadmium sulfide
An inorganic compound, yellow to orange in color, that fluoresces strongly enough when bombarded by a high-current-density electron beam to be used as a high-intensity light source.
cadmium sulfide cell
A photoconductive cell having cadmium sulfide as its photoconducting material for the production of a very high dark-light resistance ratio.
CAE
computer-aided engineering
CAIBE
chemical-assisted ion-beam etching
calcite
A doubly refracting mineral used to produce polarizing prisms. It is uniaxial negative and in the trigonal division of the hexagonal system of crystals. Its indices are e = 1.486, w = 1.658; its...
calcite interference microscope
A microscope that allows examination of a small crystal and conveniently provides linearly polarized object and reference beams so that, by suitable orientation of an anisotropic crystal, the optical...
calcium fluoride
An optical material used in place of crown glass to produce lenses with extraordinary correction of chromatic aberrations. Its high coefficient of thermal expansion and its tendency to absorb...
calcium indicator
A calcium indicator is a molecule that is sensitive to changes in calcium ion (Ca2+) concentrations in biological systems. These indicators are commonly used in various fields, including cell...
calcium iodide
A hygroscopic powder used in the photographic process.
calcium tungstate
White, tetragonal crystals used in the production of luminous coatings.
calibrated light source
A lamp whose output can be traced to a standard light source.
calibrated wedge
An optical wedge in which transmittance or density is a function of the location of the wedge, relative to a specific optical system.
calibration reference
Any known value derived from standard analysis that serves as a reference to the accuracy of an instrument or process in determining one or more variables.
Callier coefficient
The coefficient termed by Callier as the ratio between the density of photographic negatives measured by parallel light and that measured by diffuse light, due to scattering effects. This effect is...
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Photonics Dictionary
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