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Photonics Dictionary: L
Search 8,700+ definitions in the Photonics Dictionary—your authoritative source for terms in optics, lasers, imaging, fiber optics, and related technologies.
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lliter; lambert
L-bandlong band
l/mmlines per millimeter
LAlaser gyro axis
lab-on-a-chipA lab-on-a-chip (LOC) is a miniaturized device that integrates various laboratory functions and capabilities onto a single, compact chip. Also known as microfluidic devices, lab-on-a-chip systems are...
label-freeLabel-free refers to a technique or method that does not require the use of additional labels, tags, or markers to detect or identify specific components or entities. In various scientific and...
laboratory instruments and suppliesOptical laboratory instruments and supplies are essential tools and materials used in laboratories for studying and manipulating light and its properties. These instruments are widely used in...
ladarlaser detection and ranging
ladar -> lidarlight detection and ranging
ladder diagramA diagram that shows actual component signals and the basic wiring configuration of a relay logic circuit.
LAElarge-area electronics
LAEDPlarge-area electronic display panel
lagA term applied to an electric charge image in a camera tube that remains for a period of a few frames after its initial formation.
LAGEOSlaser geodynamic satellite
lambda servicesTerm for service offered by a vendor who leases a particular wavelength to a customer through DWDM technology. Lambda services are often associated with the leasing of dark fiber.
Lambert's absorption lawTransmittance of a solution, or internal transmittance of a transparent solid, is an exponential function of the thickness of the layer.
Lambert's cosine lawFlux per unit solid angle leaving a surface in any direction is proportional to the cosine of the angle between that direction and the normal to the surface. A material that obeys Lambert's cosine...
lambertA unit of luminance equal to 1/p candela per square centimeter. (l).
lambertianObeying Lambert's cosine law.
lambertian emitterAn optical source that has a luminous distribution that is uniform for all directions.
lambertian source planeIn optics, a plane that emits a flux proportional to the cosine of the angle of the normal; dense opal glass is an example.
lambertian surfaceA perfectly diffusing surface; the intensity of the light emanating in a given direction from any small surface component is proportional to the cosine of the angle of the normal to the surface. The...
lamellar gratingA grating with ridges of rectangular cross section, generally equal in width to the space between. This type of grating may be used as a beam divider.
laminatedComposed of layers.
LAMMAlaser micromass analysis
LAMMSlaser microprobe mass spectrometry
lamp -> light sourceThe generic term applied to all sources of visible radiation from burning matter to ionized vapors and lasers, regardless of the degree of excitation.
lamp housingA device designed to concentrate and direct a light source by enclosing the source in it and using a concave reflector to direct the light through its only opening.
LANlocal area network
landIn a CD-ROM disc, the reflective area between nonreflective pits representing a binary-language "off'' as opposed to the "on'' signals of the land-to-pit and pit-to-land transitions.
landolt bandA dark band that may appear in the field of crossed Nicol prisms with a powerful source such as the sun because the light is not strictly parallel and is not extinguished immediately.
landolt ringA broken circle used as the test object in distinguishing visual acuity. The width of the gap in the circle is equal to the breadth of the black line and one-fifth the circle diameter. Also known as...
Langmuir dark spaceA nonluminous area around a negatively charged probe that is inserted into the positive column of an arc or glow discharge.
Langmuir-Blodgett techniqueA method of depositing crystalline films one molecular layer at a time, by dipping the substrate into water containing a polymer that forms a single layer of molecular chains on the surface. This...
LANTIRNlow-altitude navigation and targeting infrared at night
lapA metal tool used to grind lenses with loose abrasive (see diamond cutting tool). The functional surface of the lap is carefully formed to be opposite the curve to be produced on the glass (concave...
laparoscopeAn endoscopic surgical instrument that includes a channel for the introduction of supplementary instruments.
Laplacian edge enhancementEdge enhancement technique that accentuates all edge details in an image without discriminating as to spatial orientation.
lapping1. The process of wearing down the surface of a softer material by rubbing it under pressure against the surface of a harder material that has been formed in the shape opposite to that desired on the...
lapping and polishing servicesLapping and polishing services involve specialized processes used to improve the surface finish and dimensional accuracy of components to meet specific requirements or standards. These services are...
LARESlaser ablation from rapidly exchanged sources
large-core fiberOptical fiber with a large core, often a step-index fiber; "large'' is at times defined as greater than 85 µm.
LARIATlaser radar intelligence acquisition technology
LASlaser absorption spectrometer; light-activated switch; local alignment system
LASATlaser shock adhesion test
LASCRlight-activated silicon-controlled rectifier
LASCSlight-activated silicon-controlled switch
laserlight amplification by stimulated emission of radiation
laser ablationLaser ablation is a process that involves the removal or erosion of material from a target surface using laser energy. This technique is widely used in various scientific, industrial, and medical...
laser absorption spectroscopyAn experimental research technique by which absorbed or unabsorbed radiation is analyzed in order to characterize and determine material properties, concentration as well as behavior under the...
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