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Coherent Dictionary Terms

incoherent
In optics, the term denoting the lack of a fixed phase relationship between two waves. If two incoherent waves are...
laser crystal
A laser crystal, also known as an active medium or gain medium, is a solid-state material used in the construction of...
coherent radiation
Radiation in which the phase relationship between any two points in the radiation field has a constant difference, or is...
optical parametric oscillator
A laser-pumped crystal with nonlinear optical properties inside of an optical resonator in which the output generates...
holographic camera
A holographic camera, also known as a holographic imaging system or holographic recorder, is a specialized device used to...
noncoherent bundle
An assembly of optical fibers that will not transmit coherent images or information because the relationship of the fibers...
coherent Raman effect
 magnon
A magnon is a quasiparticle representing a quantized spin wave in a magnetic material. In other words, it is a collective...
harmonic generation
Harmonic generation refers to a nonlinear optical process in which incoming photons interact with a material and produce new...
moving aperture technique
Method for reducing laser speckle in which the object field comes from a real diffuse object or the reconstructed object...
coherent anti-Stokes Raman scattering
A technique whereby two laser beams, one at an excitation wavelength and the second at a wavelength that produces Stokes...
partial coherence theory
Totally coherent radiation is produced by a purely monochromatic point source. In the real world the energy will have a...
blue diode laser
A blue diode laser is a type of semiconductor laser that emits light in the blue wavelength range of the electromagnetic...
quantum cascade laser
A quantum cascade laser (QCL) is a type of semiconductor laser that operates based on the principles of quantum mechanics....
Nd:YAG laser
Nd:YAG laser refers to a solid-state laser that utilizes neodymium-doped yttrium aluminum garnet (Nd:Y3Al5O12) as the gain...
incoherent holography
The production of holograms initially from either conventional photographs or incoherent optical equipment.
diode laser
A diode laser is a type of laser that uses a semiconductor diode as the active medium to generate coherent light....
biostimulation
The action of a biological system responding to a single or multiple coherent particles of light produced from a laser...
free-electron laser
A free-electron laser (FEL) is a type of laser that generates coherent, high-intensity electromagnetic radiation by using a...
aligned bundle
An assembly of fibers in which the coordinates of each fiber are the same at the two ends of the bundle. Also called...
coherent optical adaptive technique
The use of phase conjugation or other methods to increase the power density of a laser beam under adverse atmospheric...
laser output
The laser output refers to the generated and emitted light produced by a laser system. This output is characterized by...
speckle pattern
A power intensity pattern produced by the mutual interference of partially coherent beams that are subject to minute...
injection luminescent diode
A semiconductor diode operating in either a coherent or incoherent mode that is used as a near-infrared or visible source in...
Raman effect
When light is transmitted through matter, part of the light is scattered in random directions. A small part of the scattered...
phase-modulated sensor
A phase-modulated sensor is a type of sensor that uses modulation of the phase of a signal to measure changes in a physical...
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...
term coherence
A synonym for spatial coherence. See spatially coherent radiation.
fiber bundle
A rigid or flexible, concentrated assembly of glass or plastic fibers used to transmit optical images or light. See aligned...
Bessel functions
Two formulas used in diffractometer analysis, the first giving the individual diffraction patterns of each aperture, the...
frequency doubling
A nonlinear optical process in which the frequency of an optical beam is doubled coherently.
laser diode module
A laser diode module is a compact device that incorporates a laser diode, optics, and often other components into a single...
edge-emitting LED
An edge-emitting light-emitting diode is a type of LED structure where light emission occurs primarily along the edge of the...
parametric amplification
Means of amplifying optical waves whereby an intense coherent pump wave is made to interact with a nonlinear optical crystal...
laser active elements
Laser active elements typically refers to the substances or materials within a laser system that play a critical role in the...
optoelectronics
Optoelectronics is a branch of electronics that focuses on the study and application of devices and systems that use light...
fiber optic ribbon
A coherent optical fiber bundle in which the configuration is flat rather than round, giving an output in a line.
femtosecond laser
A femtosecond laser is a type of laser that emits ultrashort pulses of light with durations on the order of femtoseconds,...
light quantum
The individual coherent series of lightwaves that defines a quantum of radiant energy. Light quantum is equal to hv, h being...
optics
Optics is the branch of physics that studies the behavior and properties of light, including its interactions with matter...
electron cyclotron maser
A maser that relies on the fact that electrons in orbital motion in high-magnetic fields will emit energy at the cyclotron...
noncoherent radiation
Radiation having waves that are out of phase in space and/or time.
scanning coherent slope microscopy
Measures by heterodyning interferometry the local slope of a vibrating sample. The method allows the reconstruction of a...
Cooper pairs
The coupled pairs of electrons that carry supercurrents through the body of a superconductor, relative to a coherent...
Q-switched pulse
A laser output that occurs when the cavity resonator Q is first kept very low, using rotating mirrors or saturable...
fiber optic faceplate
A plate made up of thousands of glass fibers arranged parallel to one another, i.e., in a coherent bundle, and fused...
xenon flashtube
A high-intensity source of incoherent white light in which a capacitor is discharged through a tube of xenon gas; often used...
colliding pulse modelocked ring laser
A ring dye laser that uses prisms and a saturable absorber within the laser cavity to shape and shorten the pulses...
hologram
An interference pattern that is recorded on a high-resolution plate, the two interfering beams formed by a coherent beam...
coherent bundle
optical testing instrument
An optical testing instrument is a device or system used to evaluate and measure the performance, quality, and...
mutual coherent function
A function that quantifies the performance degradation of coherent communications systems, imaging systems and all systems...
laser
A laser, which stands for "light amplification by stimulated emission of radiation," is a device that produces coherent and...
acoustical holography
The optical reconstruction of image information contained in a sound field. First the diffraction pattern, formed by an...
local oscillator laser
In coherent optical communications systems, a laser used at the receiving end to produce a steady wave that is combined with...
medical lasers
Medical lasers are devices that produce intense beams of light with specific characteristics and properties, which are used...
optical nonlinearity
The phenomenon that makes nonlinear the mathematical expression for the electrical polarization of a medium through which...
solid-state imaging system
An imaging system that uses a mosaic of tiny light-sensitive semiconductors (phototransistors) to produce individual outputs...
confocal resonator
A confocal resonator, also known as a confocal cavity or confocal laser resonator, is a type of optical resonator...
laser cavity
A laser cavity, also known as an optical cavity or resonator, is a fundamental component of a laser system. It is a confined...
Bose-Einstein condensate
A Bose-Einstein condensate (BEC) is a state of matter that forms at temperatures close to absolute zero. It is named after...
maser
An acronym for microwave amplification by stimulated emission of radiation. Predecessor to the laser, the maser or...
fiberscope
An optical instrument consisting of an objective lens, a coherent (usually flexible) fiber bundle and an eyepiece to examine...
supercontinuum
Supercontinuum refers to a broad spectrum of light that spans a wide range of wavelengths, typically from the visible to the...
solid-state laser
A solid-state laser is a type of laser that uses a solid gain medium (as opposed to a liquid or gas) to produce coherent...
holography
Holography is a technique used to capture and reconstruct three-dimensional images using the principles of interference and...
spatial light interference microscopy
Spatial light interference microscopy (SLIM) is an optical microscopy technique that belongs to the category of quantitative...
microchannel spatial light modulator
A device to modulate spatially a collimated coherent beam of light with input data in optical data processing. It uses a...
coherent light source
A light source that is capable of producing radiation with waves vibrating in phase. The laser is an example of a coherent...
sonoptography
The process whereby sound waves are employed to form a three-dimensional image of an object. The process involves generally:...
kinoform filter
A computer-generated kinoform used for data processing because of its use of incoherent light and its wide field of view,...
microbubble resonator
A microbubble resonator is a device used in photonics and optical physics for the precise manipulation of light waves. It...
laser surgery
Laser surgery refers to a medical procedure in which a laser, or focused beam of light, is used as a precision tool to cut,...
reconstruction wave
The coherent wave used to play back a recorded hologram. It is identical to the reference wave used in the generation of the...
sonosensitive plate
Device that uses a coherent reference wave to record the interference patterns produced by incident ultrasonic waves on an...
coherent fiber bundle
A coherent fiber bundle (CFB), also known as a coherent fiber optic bundle, is an assembly of multiple optical fibers...
distributed feedback laser
A distributed feedback laser (DFB laser) is a type of semiconductor laser diode designed to emit coherent, narrow-bandwidth...
phase matching
Phase matching is a crucial concept in the field of optics, particularly in nonlinear optics and the generation of coherent...
parametric oscillator
A device using a parametric amplifier inside a resonant optical cavity to generate a frequency-tunable coherent beam of...
stimulated emission
Radiation similar in origin to spontaneous emission but determined by the presence of other radiation having the same...
holographic nondestructive testing
The application of coherent wavefront techniques to the determination of the physical state of a system without appreciably...
fiber optic taper
A coherent fiber optic bundle made from fibers whose diameter changes gradually along its length. Used to magnify or reduce...
laser dye
Class of organic dyes that emit coherent radiation over a wide spectral range.
diode-pumped solid-state laser
A diode-pumped solid-state laser (DPSSL) is a type of laser system that uses semiconductor diode lasers to pump energy into...
computer-generated hologram
A computer-generated hologram (CGH) is a holographic image produced using computational methods and algorithms, rather than...
bias buildup
Degradation factor in coherent light systems where the amplitude of the recorded signal is decreased as the number of object...
incoherent bundle
A bundle of filaments of optical glass or other transparent materials that transmit only light, not optical images. The...
transverse scattering
The method for measuring the index profile of an optical fiber or preform by illuminating it coherently and transversely to...
attosecond-pump attosecond-probe spectroscopy
Attosecond-pump attosecond-probe spectroscopy (APAP) is an advanced technique in ultrafast spectroscopy that allows...
laser microscopy
Technique using functional optical microscope with the addition of a coherent source collinear with the image path. The...
microwave holography
The holographic recording of the pattern formed by two sets of coherent microwaves that interfere at a scanning plane. A...
diffractive optics
Optical elements that use diffraction to control wavefronts. Diffractive optical elements include diffraction gratings,...
frequency comb
A frequency comb is a precise and regular series of equally spaced spectral lines, or frequencies, that are generated with...
helium-neon laser
A helium-neon (HeNe) laser is a type of gas laser that emits visible red light at a wavelength of 632.8 nm. It operates...
spatially coherent radiation
The correlation of radiation between the phases of monochromatic radiation emanating from two separate points.
lensless microscopy
Lensless microscopy, also known as computational or holographic microscopy, is an imaging technique that captures and...
laser probe
Coherent source used for analysis of excited state species.
Lloyd's mirror
A mirror employed with a very high incidence angle to form a pair of coherent light sources by reflection, and therefore...
coherent communications
A fiber optic communications system that works on the principles of homodyning or heterodyning. The transmitting laser...
degree of coherence
A quantitative measurement of the coherence of a light source; equal to the visibility (V) of the fringes of a two-beam...
image enhancement laser
A semiconductor platelet laser that emits a coherent image by means of plane optical pumping over the platelet surface, and...
coherent noise
The manifestation of light from scatterers outside the plane of the object in coherent light systems. The output of these...
transversely excited atmosphere laser
Also known as TEA laser. A coherent optical source with a wide wavelength range in the infrared, visible and ultraviolet...
superradiance
Directional and coherent radiation pulses that result from an ensemble of coherently prepared states in an optical medium.

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