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8,236 terms
Photonics Dictionary
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solid-state drive
A solid-state drive (SSD) is a storage device that stores data electronically using solid-state memory chips. Unlike traditional hard disk drives (HDDs) that use spinning disks and mechanical...
solid-state imaging system
An imaging system that uses a mosaic of tiny light-sensitive semiconductors (phototransistors) to produce individual outputs that are then converted into a coherent video signal.
solid-state lamp
An electroluminescent semiconductor that emits low intensity radiation in the green or red regions. Used as an indicator lamp.
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 light. The term "solid-state" refers to the fact that the active medium, where...
solid-state light valve
A light valve that uses a crystal as the control layer medium and that operates on the principle of the electro-optic effect.
solid-state linear motor
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piezo worm
A piezoelectric translator that moves up and down a spindle like a caterpillar. It clamps itself at one end, expands, clamps the other end, releases the first end, and then contracts and begins the...
soliton
Any isolated wave that propagates without dispersion of energy. Specifically to photonics, an ultrashort pulse of laser light that propagates through a waveguide without characteristic chromatic...
soliton laser
A color center laser whose output is coupled to an external control laser cavity and then fed back to the main laser cavity to provide enhanced pulse shaping, leading to ultrashort pulse generation.
sonde
A ruggedized scintillation counter used in oil well logging. The cylindrical housing contains a gamma ray source, a crystalline scintillator and a photomultiplier tube. As the sonde is drawn through...
SONET
synchronous optical network
Sonnar lens
A photographic objective that uses the thick meniscus principle to obtain its power. It is designed to photograph small fields at large apertures.
sonoholography
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acoustical holography
Acoustical holography is a technique used to visualize and analyze sound fields in three-dimensional space. It involves capturing the complex spatial distribution of acoustic waves, much like how...
sonoluminescence
The luminescence of a substance resulting from its exposure to ultrasonic waves.
sonoptography
The process whereby sound waves are employed to form a three-dimensional image of an object. The process involves generally: the recording of the diffraction pattern of an object exposed to sound...
sonoradiography
The diagnostic procedure that uses ultrasonic energy to probe the body and, with the help of laser beams, a reflecting membrane to produce a three-dimensional picture.
sonosensitive plate
Device that uses a coherent reference wave to record the interference patterns produced by incident ultrasonic waves on an object.
SOP
state of polarization
SOQE
Society for Optical and Quantum Electronics
SOS
silicon on sapphire
sound pressure
Calculated at a given point in a medium as the instantaneous pressure at that point in the presence of a sound wave, minus static pressure at that point.
source
A physical source of radiation, as contrasted to illuminant. See illuminant.
source correlation
The relationship between different wavelengths of light generated by a source, which may affect the spectral distribution of the light as it travels great distances in space; put forth by physicist...
source efficiency
The ratio of emitted optical power of a source to the input electrical power.
space charge
A volumetric electrical charge resulting from a flow of charged particles across a gap.
space pattern
On a test chart, the pattern designed to direct and measure geometric distortion.
space-division multiplex
In fiber optics, the condition in which each fiber of a bundle carries a separate channel.
spaser
A spaser (surface plasmon amplification by stimulated emission of radiation) is a nanoscale device that generates coherent optical radiation at nanometer-scale dimensions. It is analogous to a laser...
spatial averager
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low-pass filter
In digital image processing, a method of convolution that reduces random noise by replacing the value of each pixel with the average of that pixel plus its neighbors, or of the neighbors alone. Also...
spatial coherence
The maintenance of a fixed-phase relationship across the full diameter of a cross section of a laser beam.
spatial condition
The spatial distribution of incident and collected flux contained in the analysis of reflectance, transmittance or densities.
spatial filter
1. Generally, an emulsion mask having a clean annular region in an otherwise opaque region. It is designed to eliminate undesired information. 2. A pinhole in a metal plate, placed at a focal plane...
spatial filtering
In image processing, the enhancement of an image by increasing or decreasing its spatial frequencies.
spatial frequency
With a repetitive object such as a series of equispaced lines, the reciprocal of the line spacing in object or image, generally expressed in cycles per millimeter.
spatial intensity perturbation
A beam instability, induced by index of refraction inhomogeneities and component damage of dirt and dust particles, that exhibits exponential growth and causes both system degradation and energy loss...
spatial light interference microscopy
Spatial light interference microscopy (SLIM) is an optical microscopy technique that belongs to the category of quantitative phase imaging methods. It is designed to provide high-resolution,...
spatial light modulator
A spatial light modulator (SLM) is an optical device that modulates or manipulates the amplitude, phase, or polarization of light in two dimensions, typically in the form of an array. SLMs are...
spatial mode
Also known as transverse mode. The configurations of energy storage, relative to the structure of a laser resonator, that define the relative intensity distribution of the laser beam.
spatial phase shift
The change in position of the image of a sine wave object from its ideal position. Usually measured in degrees with 360° designating a full cycle of the image.
spatial resolution
Spatial resolution refers to the level of detail or granularity in an image or a spatial dataset. It is a measure of the smallest discernible or resolvable features in the spatial domain, typically...
spatially coherent radiation
The correlation of radiation between the phases of monochromatic radiation emanating from two separate points.
spatially offset Raman spectroscopy
Spatially offset Raman spectroscopy (SORS) is a technique that extends traditional Raman spectroscopy by incorporating measurements at different spatial offsets. This method allows for the selective...
spatio-temporal optical coherence tomography
Spatio-temporal optical coherence tomography (ST-OCT) is an advanced imaging technique that combines the principles of optical coherence tomography (OCT) with spatio-temporal modulation methods to...
spatter
Of evaporative coatings, a condition resulting when small chunks of material fly from the hot crucible onto the substrate surface and adhere there.
SPC
statistical process control
SPD
spectral power distribution
SPE
solar proton event
specific stiffness
The ratio of Young's modulus to density of a material.
speckle effect
In laser systems, the granular effect that is noted when observing the expanded cross section of a laser beam.
speckle imaging
A technique for obtaining improved resolution of images produced by large telescopes and distorted by the effects of atmospheric turbulence. Many individual exposures are recorded at high speeds by a...
speckle interferometry
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speckle metrology
Refers to the variety of techniques that use the interference pattern produced by laser light diffusely reflected by an object. There are two basic techniques: direct laser photography, used when...
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Photonics Dictionary
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