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5,268 terms
Photonics Dictionary
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fiber optic sensor
A fiber optic sensor is a device that uses optical fibers to detect and measure physical, chemical, biological, or environmental parameters. Unlike traditional electrical sensors, fiber optic sensors...
fiber optic spectrometer
A fiber optic spectrometer is a device used for measuring the spectral content of light. It utilizes optical fibers to transmit light from a source to a spectrometer unit, where the light is...
fiber optic transceiver
A fiber optic transceiver, often simply referred to as an "optical transceiver," is a device used in fiber optic communications to transmit and receive data over optical fibers. It integrates both a...
fiber optics
The use of thin flexible glass or plastic fibers as wave guides — or "light pipes" — to channel light from one location to another. Fiber optics is based off of the principle of total...
fiber photometry
An optical recording technique that uses light source(s), a beamsplitting cube, light detector(s) and an optical fiber chronically implanted in animal brain to deliver excitation light to neurons...
fiber undercut
The distance between the surface of a ferrule and the surface of a fiber end, provided that the ferrule extends above the fiber end. If the fiber end extends above the ferrule surface, the difference...
fiber-based confocal luminescence microscope
A microscope in which laser light is delivered through single-mode fibers that replace the pinhole usually used in confocal microscopy. When the Gaussian mode is imaged from the fiber output onto the...
fiber-coupled LED
A fiber-coupled LED (light-emitting diode) refers to an LED device that is optically coupled to an optical fiber for the purpose of efficient light transmission. In this configuration, the LED serves...
fiber-coupled photoconductive antenna
A fiber-coupled photoconductive antenna (FCPA) is a type of optoelectronic device that combines a photoconductive antenna with optical fibers for the purpose of generating or detecting terahertz...
fiber-lens fusing
A method of terminating optical fibers by forming a lens directly on the end of the fiber, eliminating the need for precise end-to-end placement or epoxy sealing in fiber connections.
fiber-linked array image formatter
A wide-field multiobject spectroscopy system used in astronomy, in which a bundle of low-loss optical fibers positioned on the target images is rearranged at its other end into a linear array along...
fiberless optics
->
free-space optics
Free-space optics (FSO), also known as optical wireless communication or optical wireless networking, refers to the transmission of data using modulated beams of light through free space (air or a...
Fick's law
Relation between a material's transport rate and the material's concentration gradient and the diffusion coefficient.
field
1. In raster scan television, one of the two scans that are interlaced to make up a frame. 2. See field of view.
field curvature
->
curvature of field
A lens aberration that causes a flat object surface to be imaged onto a curved surface rather than a plane.
field effect transistor photodetector
A photodetector employing photoregeneration of carriers in the channel region of an FET structure to provide photodetection with current gain.
field emission display
An X-Y electrically addressable series of arrays with individual electron emitters bombarding a phosphor-coated transparent plate. The phosphor is induced into luminescence, similar to traditional...
field emission microscope
An image-forming instrument in which a strong electrostatic field causes cold emission of electrons from a sharply rounded point or from an object that is located on that point. The electrons are...
field frequency
->
field repetition rate
The number of fields scanned per second in a television system. The US standard is 60. Also called field frequency.
field ion microscope
An extremely powerful microscope that renders individual ionized atoms visible by using an electric field to propel the ions to a fluorescent screen where they are magnified.
field of collimator
An expression of the tolerance of decentration of a laser diode from the optical axis: the region around the axis in the focal plane of the collimator in which the facet can be located and still...
field of view
The field of view (FOV) refers to the extent of the observable world or the visible area that can be seen at any given moment through a device, such as an optical instrument, camera, or sensor. It is...
field pattern
Intensity of emission as a function of direction in a given plane.
field repetition rate
The number of fields scanned per second in a television system. The US standard is 60. Also called field frequency.
field stop
An aperture located at an image plane of an optical system that determines the size and shape of the image.
filament emission
The freeing of electrons from a filament in an electron tube as the result of the filament being heated by an electric current.
film plane
The site behind the lens system in a camera where photographic media are positioned for exposure.
film platen
A mechanism in a camera designed to position the film in the focal plane for exposure.
film reader
A device used to scan images or information on photographic film for the subsequent relay of information.
film recorder
An instrument designed to place nongraphic information, usually generated by a computer, onto photographic film. The information is generally encoded as a series of opaque and translucent spots, or...
film scanning
The process by which the light from the images of photographic film is encoded into electrical signals for video transmission.
film thickness gauge
An interferometer spectrometer designed to measure thicknesses of thin films or layers by recording the interferogram and by having a computer within the instrument to establish the distance between...
film weld
The butt (edge to edge) splice of two pieces of film produced by a heat splicer that melts the edges together; used in editing motion picture film.
filovirus
Filoviruses are a family of viruses that are responsible for severe and often fatal hemorrhagic fevers in humans and non-human primates. The name "filovirus" is derived from their filamentous...
filter
1. With respect to radiation, a device used to attenuate particular wavelengths or frequencies while passing others with relatively no change. 2. See digital filter.
filter factor
The necessary increase of a photograph's exposure time as the result of the additional absorption of light by the filter being used.
filter grating
A grating used as a reflectance filter, particularly in the far-infrared. Small plane gratings, blazed for the wavelength of the unwanted radiation, are produced for this purpose.
filter kernal
A function used in a convolution filtering operation. The image to be filtered is convolved with the filtering kernel to obtain the enhanced image.
finesse
For a Fabry-Perot interferometer or etalon, a value for the transmission bandwidth which can be calculated as the ratio of the free spectral range to the full width half maximum of the transmission...
fingerprint camera
A fixed-focus camera designed to record the ink impression of fingerprints that have been impressed on a card or form for record purposes.
finished lens molding
A method used to produce precision spherical and aspheric molded glass lenses without grinding or polishing.
finite sampling theorem
A finite version of Shannon's sampling theorem that states that a class of functions can be reconstructed exactly by a sufficient number of spectral samples; the reconstructed function is an explicit...
first window
The spectral transmission window in silica-based fibers between 830 and 850 nm.
first-order optics
->
Gaussian optics
1. That branch of optics that illustrates the theory in which q is substituted for sin q in Snell's law. Effective results are achieved if the aperture and field angle are made very small. The...
first-order spectrum
The separate spectral lines formed by a diffraction grating that are characterized by one wavelength difference in path length between adjacent slits.
first-order theory
->
Gaussian optics
1. That branch of optics that illustrates the theory in which q is substituted for sin q in Snell's law. Effective results are achieved if the aperture and field angle are made very small. The...
first-side meniscus
The process of grinding the concave surface of a single-vision spherical lens.
first-side toric
The process of grinding the toric surface of a single vision sphero-cylindrical lens.
FIRT
far-infrared transmission
FISH
fluorescence in situ hybridization
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Photonics Dictionary
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