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Photonics Dictionary: L

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light-activated silicon-controlled switch
Similar to LASCR, except that all four regions are available.
light-beating spectroscopy
The spectroscopic analysis of optical line shapes and frequency shifts, using the technique of light beating; i.e., the mixing of two narrowband optical components to produce an AC component in the...
light-emitting diode
An LED, or light emitting diode, is a semiconductor device that emits light when an electric current passes through it. LEDs are widely used in various applications due to their energy efficiency,...
light-powered telephone
Technology that relies on a highly efficient photodetector that can detect incoming light signals at one frequency and transmit outgoing signals at another, thus permitting the sending and receiving...
lightguide -> fiber optic lightguide
A bundle of optical fibers arranged randomly for the purpose of transmitting energy, not an image.
LIGO
laser interferometer gravitational wave observatory
LIL
laser integration line
LIMA
laser-induced mass analysis
limiting angle of resolution
The angle subtended by two points or lines that are just far enough apart to be distinguished as separate. The ability of an optical device to resolve two points or lines is called resolving power...
limiting angular subtense (amin)
The apparent visual angle that divides intrabeam viewing from extended-source viewing.
limiting aperture
The maximum circular area over which radiance and radiant exposure can be averaged.
LIMS
laser ionization mass spectrometry
lin
linear
linac
linear accelerator
linac -> linear accelerator
A device used to accelerate the electrons in a free-electron laser. There are several types, including the induction linear accelerator, the radio frequency linear accelerator and the superconducting...
linar
Celestial point sources that emit specific wavelengths of radiation that appear on spectral charts as narrow lines. The term linar is a contraction of line and star.
line of sight
The line of vision; the optical axis of a telescope or other observation system. The straight line connecting the object and the objective lens of the viewing device.
line scan
Line scan refers to a method of capturing images or data by scanning a single line at a time, as opposed to capturing the entire image simultaneously. This technique is commonly used in various...
line source
In the spectral sense, an optical source that emits one or more spectrally narrow lines as opposed to a continuous spectrum. In the geometric sense, an optical source whose active (emitting) area...
line spectra
Spectra that originate from atoms; they are composed of lines having irregular spacing and intensity.
line spectrum
A spectrum formed by radiation whose energy values of the property being measured cluster about at least one discrete value, as opposed to a continuous spectrum. The actual width of the spectral line...
line spread function
The intensity distribution seen when scanning the image of a line, in the direction perpendicular to that line.
line-narrowed laser
A semiconductor laser in which the naturally occurring broad linewidth has been narrowed by incorporating the laser diode into a large resonant external cavity.
line-scan camera
A line-scan camera, also known as a line-scan image sensor or linear array camera, is a type of digital camera designed to capture images one line or row of pixels at a time, rather than a full...
line-scan recording
A type of recording in which the recording line remains fixed and the recording medium is fed past the recording device.
line-selectable laser -> tunable laser
Any form of laser; e.g., a dye laser, having an output that can be adjusted over a wide range of wavelengths. Normally the range is about 70 nm wide.
lineament
A mappable surface feature arranged in straight or curved lines that is distinguished from surrounding surfaces and is formed as a result of the landform's internal characteristics.
linear accelerator
A device used to accelerate the electrons in a free-electron laser. There are several types, including the induction linear accelerator, the radio frequency linear accelerator and the superconducting...
linear actuator
High-precision motorized positioning device, often linked to computer control equipment.
linear amplifier
Amplifier in which the input and output pulse heights are directly proportional.
linear array
A solid-state video detector consisting of a single row of light-sensitive semiconductor devices, used in linear-array cameras.
linear element
A device for which the output electric field is linearly proportional to the input electric field, and no new wavelengths or modulation frequencies are generated.
linear encoder -> optical encoder
A device designed to measure linear or rotary motion by detection of the movement of markings on a transparent medium past a fixed point of light. The encoder has a moving code plate, a glass disc...
linear energy transfer
The transfer of energy lost by radiation to the body, relative to the loss of energy per unit of path traveled.
linear field
The measured width of the field of view at any distance.
linear image sensor
A linear image sensor is a type of solid-state electronic device used to capture and convert light into electrical signals. Unlike area image sensors (such as CCD or CMOS sensors), which capture an...
linear optics
Linear optics refers to the study and manipulation of light in a linear and deterministic manner, where the response of optical elements is proportional to the amplitude of the incident light wave....
linear plastic
A term for thermoplastic optical materials; that is, those in which the polymer chains remain linear after heating and molding and which thus can be remolded again and again, unlike thermoset...
linear polarization
See plane-polarized light; polarization.
linear positioning stage
A linear positioning stage, also known as a linear stage or translation stage, is a precision mechanical device used to accurately move and position objects along a linear axis. These stages are...
linear receive optics
Linear receive optics typically refers to the optical components and systems used in the reception (detection) of linearly polarized light signals in various applications, such as optical...
linearity
A relationship between two variables so that when plotted on a graph they yield a straight line.
lineation
Subsurface linear arrangement of elements of rock that is not mappable; lineation is a one-dimensional characteristic.
linewidth
Linewidth, also known as spectral linewidth or line width, refers to a measure of the width of a frequency spectrum of a signal or a resonance. It indicates the range of frequencies over which the...
link
In data communications, the instrumentation connecting two stations: transmitters, receivers and the cable that runs between them.
Linnik interference microscope
A Michelson-type interference microscope used to produce interference patterns of reflective specimens through the interference between light reflected by the specimen and that reflected by a...
LINS
laser inertial navigation system
LION
local integrated optical network
lip
A defect in the cleaved end face of an optical fiber, in the form of a sharp protrusion at the edge of the fiber.
Lippich prism
A small half-shade analyzer placed in the eyepiece of a polarimeter to determine the character of the polarized light emitted by the instrument. It consists of a Nicol prism situated so that it...

Photonics DictionaryL

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