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Photonics Dictionary: L

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liquid core optical fiber
Multimode straight fiber capable of transporting linearly polarized light with any incident polarization angle, and in which no form of internal stress can develop that could lead to birefringence.
liquid crystal
Liquid crystals are a state of matter that exhibits properties intermediate between those of conventional liquids and solid crystals. In a liquid crystal, the molecules are ordered like those in a...
liquid crystal display
An alphanumeric display formed by a layer of liquid crystal material sandwiched between two sheets of glass; a transparent conductive coating on the glass is etched to form the character segments. An...
liquid crystal eyewear
A wireless stereo imaging device used in conjunction with a monitor to produce a virtual interactive environment. Liquid crystal shutters in the eyewear are synchronized with the monitor at 120...
liquid crystal light valve
A liquid crystal light valve (LCLV), also known as a spatial light modulator (SLM), is an optical device that modulates the intensity, phase, or polarization of light passing through it using liquid...
liquid crystal on silicon
Liquid crystal on silicon (LCoS) is a display technology that combines liquid crystal materials with silicon-based semiconductor technology to create high-resolution, high-quality images. LCoS...
liquid filter
A solution or combination of solutions that serves as a filter.
liquid gate
An immersion liquid used to treat polarizing filters to eliminate the effects of surface variations and to minimize the optical path difference between that part of the spectrum that passes through...
liquid laser
A laser that uses a substance in the liquid state, such as an organic dye, as the active lasing medium.
liquid lightguide
An optical fiber with a hollow core filled with a liquid material that has a higher refractive index than the solid surrounding it.
liquid marble
Liquid marble refers to a unique form of microscale liquid encapsulation, where small droplets of liquid are coated with a fine layer of hydrophobic powder, such as silica nanoparticles or Teflon....
liquid mirror
A mirror composed of liquid, taking advantage of the parabolic shape of a spinning liquid and the fact that the mirror's focal length can be adjusted by altering the velocity at which the liquid's...
liquid-phase epitaxy -> epitaxy
A well controlled thin films technique for growing films with good crystal structure in ultra high vacuum environments at very low deposition rates. Epitaxy methods are well known for the growing of...
liquid-surface holography
The acoustical holographic process in which the hologram consists of slight elevations in a liquid surface, in the areas of the antinodes of the interference pattern. Light diffracted from this...
laser isotope separation
Lissajous pattern
The pattern, formed by a character generation cathode-ray tube system, in which the characters are made up of wave shapes synthesized by a series of sine and cosine terms.
lithium fluoride
A crystal often used for windows and refracting components in the ultraviolet, visible and infrared. Characteristically, this form has excellent transmission from 0.14 to 6.0 µm.
lithium niobate
A crystalline ferroelectric material used primarily as a substrate and an active medium for thin-film optical modulators and switches. It possesses very high electro-optic and piezoelectric...
Lithography is a key process used in microfabrication and semiconductor manufacturing to create intricate patterns on the surface of substrates, typically silicon wafers. It involves the transfer of...
Littrow prism
A 30-60-90° spectrograph prism that is coated on the surface opposite the 60° angle with a reflecting film.
Littrow spectrograph
A spectrograph using a prism that has an internally reflecting surface and that serves as a constant deviation prism.
linear low-density polyethylene
low light level
low-light-level television
Lloyd's mirror
A mirror employed with a very high incidence angle to form a pair of coherent light sources by reflection, and therefore forming interference bands.
lunar laser ranging
lumens per second
laser megajoule
laser magnetic resonance
logarithm to the base e
LN (LN2)
liquid nitrogen
launch numerical aperture; low-noise amplifier
longitudinal optical; local oscillator
laser optoacoustic
large optical cavity
local area network
Data communications network in a clearly defined geographical location, and extending no more than a few miles in length. It generally takes in an office building or group of buildings, a campus or...
local injection detection system
A device used to evaluate the quality of fiber optic splices made in the field by injecting light into the cladding of the fiber and measuring the output at the other end of the splice.
local oscillator laser
In coherent optical communications systems, a laser used at the receiving end to produce a steady wave that is combined with the incoming laser signal before detection, generating a composite wave...
lock-in amplifier
A lock-in amplifier is a specialized electronic instrument used to extract and measure small signals embedded in noise or interference. It is particularly useful in fields such as spectroscopy,...
low-operating-current light-emitting diode
logarithm to the base 10
log converter
A device designed to convert linear change in the light state at input to log data at output.
logarithmic transformation
One class of nonlinear space-invariant transformation processes used for processing convolved and multiplied signals.
logic circuit
A computer circuit that supplies the action of problem-solving functions or operations.
logic diagram
A diagram that uses special symbols called logic symbols to represent the detailed functioning of electronic logic circuits. The symbols do not represent the type of electronics used, but only their...
logic-to-light device
A fiber optic component or system designed in such a way that it can be operated by people without specialized knowledge of the field.
laminated object manufacturing
Leningrad Optical Mechanical Organization
London equations
The partial differential equations for the spatial and time dependence of electric and magnetic fields inside a semiconductor. They are the analog of Maxwell's equations, which apply to the electric...

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