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8,726 terms

Photonics Dictionary

FECO
fringes of equal chromatic order
FED
field emitter display
feed
To supply a signal to some point.
feedback
The transfer of a part of a device's or circuit's output back to its input.
feedback amplifier
An amplifying device that returns a portion of its output to its input as a means of modifying the device's performance.
feedback circuit
A circuit that permits feedback in an electronic device.
feedback compensation
The placement of a device or an additional circuit into a feedback control system to improve its response in relation to a specific characteristic of the system.
feedback control system
A system designed to control the output quantity of a device by returning a portion of its output signal to its input. This results in the manipulation of the input quantity so that the desired...
feeder
A waveguide or coaxial cable that transmits a signal from an antenna to a receiver or from a transmitter to an antenna.
FEL
free-electron laser
Felgett advantage
The signal-to-noise ratio (SNR) obtained with a Fourier transform spectrometer when detector noise prevails, which exceeds the SNR of a scanning spectrometer in the same time by a factor proportional...
femto
The prefix denoting 10-15. (f).
femtosecond laser
A femtosecond laser is a type of laser that emits ultrashort pulses of light with durations on the order of femtoseconds, where one femtosecond is equal to 10-15 seconds. These lasers are capable of...
feret's diameter
In microscopy, the measured distance between theoretical parallel lines that are drawn tangent to the particle profile and perpendicular to the ocular scale.
Fermat's principle
The principle that a light ray extending from one point to another will, after any number of reflections and refractions, follow the path requiring the least transit time. This is also known as the...
Fermi liquid state
The Fermi liquid state refers to a specific state of matter in quantum mechanics, particularly describing the behavior of interacting fermions (particles with half-integer spin, such as electrons) at...
Fermi-Dirac function
The mathematical expression of the probability of any given state of energy being occupied when a semiconductor is in thermal equilibrium.
ferric oxide -> rouge
A very fine powdered ferric oxide used in polishing lenses.
ferroelectric crystal
A crystal capable of being polarized in the reverse direction when an electric field is applied.
ferroelectric domain
The region of a ferroelectric crystal where spontaneous polarization is uniformly directed.
ferroelectric film
Film in which electric polarization is reversible when influenced by an electric field.
ferroelectric materials
Ferroelectric materials are a type of dielectric materials that exhibit spontaneous electric polarization, meaning they possess a permanent electric dipole moment even in the absence of an external...
ferroelectricity
The phenomenon whereby certain crystals exhibit spontaneous electric polarization. It is analogous with ferromagnetism.
ferromagnetism
The properties of certain materials that cause them to have relative permeabilities that exceed unity. This permeability permits the materials to exhibit hysteresis.
ferrule
A mechanical fixture, generally a rigid tube, used to confine the stripped end of a fiber or a fiber bundle.
Ferry-Porter law
The law stating that the critical fusion frequency is approximately proportional to the logarithm of the luminance and the area.
fery prism
A prism with curved faces that collimates, reflects and refracts incident light. Often used in the production of spectrographs.
FET
field-effect transistor
fF
femtofarad
FFD
flange focal distance
FFL
front focal length
FFT
fast Fourier transform
FIB
focused ion beam
fiber -> optical fiber
Optical fiber is a thin, flexible, transparent strand or filament made of glass or plastic used for transmitting light signals over long distances with minimal loss of signal quality. It serves as a...
fiber axis
The mechanical centerline through the core of an optical fiber.
fiber bandwidth
The lowest frequency at which the magnitude of the fiber transfer function decreases to a specified fraction of the zero frequency value. Often, the specified value is one-half the optical power at...
fiber Bragg grating
A fiber Bragg grating (FBG) is a type of optical filter that is inscribed or "written" into the core of an optical fiber. It consists of a periodic modulation of the refractive index along the length...
fiber bundle
A rigid or flexible, concentrated assembly of glass or plastic fibers used to transmit optical images or light. See aligned bundle; incoherent bundle.
fiber curl
A property of optical fiber that results from thermal stresses during manufacturing and is defined as the amount of curvature over any specified length of fiber.
fiber distributed data interface
A standard for fiber optic data transmission systems being developed by the American National Standards Institute (ANSI) and associated working groups that will make fiber optic components from...
fiber fuse
A phenomenon in which high optical power, encountering an imperfection in an optical fiber, destroys the fiber's core and causes damage to back-propagate down the fiber. It is caused by classic...
fiber fusion -> fusion splice
A splice accomplished by the application of localized heat sufficient to fuse or melt the ends of two lengths of optical fiber, forming a continuous single fiber.
fiber joints
Fiber joints, also known as fiber optic splices, refer to the connection points where two optical fibers are permanently joined together to form a continuous optical transmission path. These joints...
fiber lapping
A method of optical fiber coupling in which the fibers are ground down to expose their cores and placed together to allow light pulses to transfer from one to the other.
fiber laser
A fiber laser is a type of laser in which the active gain medium is an optical fiber doped with rare-earth ions such as erbium, ytterbium, or neodymium. Fiber lasers generate coherent light through...
fiber optic acessories
Fiber optic accessories are various components and tools used to enhance, manage, protect, and optimize the performance of fiber optic networks and systems. These accessories support the...
fiber optic attentuators
A fiber optic attenuator is a passive optical component designed to attenuate or decrease the intensity of an optical signal traveling through a fiber optic link. It achieves this by introducing a...
fiber optic bundles
Fiber optic bundles consist of multiple optical fibers grouped together within a common protective sheath or coating. These bundles are used to transmit light from one point to another, often for...
fiber optic cable assembly
A fiber optic cable assembly refers to a complete unit consisting of optical fibers, connectors, protective jackets, and other components that are assembled together to facilitate the transmission of...
fiber optic cable
A package for an optical fiber or fibers that may include cladding, buffering, strength members and an outer jacket.

Photonics Dictionary

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