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Photonics Dictionary: S

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S
siemens
s
second
S-ARROW
simplified antiresonant reflecting optical waveguide
S-SEED
symmetric self-electro-optic effect device
S/LJ
semiconductor/liquid junction
S/N
signal-to-noise ratio
Sabattier effect
The reversal of a developed image due to the exposure of the partially developed image to actinic light.
saccadic motion
The movement of the eye as it focuses on details of a scene. Some imaging systems mimic this movement by small, rapid scanning motions of the sensor.
saccharimeter
A special-purpose polarimeter having a scale calibrated directly in the concentration of sugar in the test solution.
SAD
selected area diffraction
saddle
A term used to describe a saddle-shaped -- i.e., convex along one axis, concave along the other -- polished surface, generally an error, whose contours are apparent by the shape of Newton's rings.
safelight
Filtered light to which photographic or other photosensitive materials are not responsive; used to illuminate darkrooms when film is being processed. The color of the filter varies according to the...
sag
1. In the geometric sense, an abbreviation for the term "sagitta,'' the height of a curve measured from the chord. and it is exact for a parabola. 2. Conforming a sheet of glass to a...
sag
sagitta
sagged bevel
The shape of the edge of a concave surface when the depth of the bevel plane to the vertex of the surface is controlled to a required distance.
sagitta -> sag
1. In the geometric sense, an abbreviation for the term "sagitta,'' the height of a curve measured from the chord. and it is exact for a parabola. 2. Conforming a sheet of glass to a...
Sagnac interferometer
A type of interferometer in which two coils of optical fiber are arranged so that light from a single source travels clockwise in one, and counterclockwise in the other. Rotation of the coils causes...
Saha equation
Formula that describes the thermal equilibrium of gas electrons and ions as a direct function of variations in temperature.
SALI
surface analysis by laser ionization
SAM
scanning acoustic microscope; scanning Auger microscopy
SAM-APD
separate absorption and multiplication region avalanche photodiode
SAMA
Scientific Apparatus Makers' Association
SAMPE
Society for the Advancement of Material and Process Engineering
sample point
On a chromaticity diagram, the point that denotes the chromaticity sample.
sample-and-hold circuit
A device that acquires a signal and then stores it for a specified period of time before processing, and used, for example, to reduce noise as in correlated double sampling.
sampling theorem -> Nyquist criterion
In image acquisition (and sampling theory), the postulate that the pickup sampling frequency must be a minimum of twice as high as the Nyquist rate of brightness change of any detail to be resolved....
SAN
styrene acrylonitrile; storage area network
sand hole
A crude area on the polished surface, produced during coarse grinding, that subsequent fine grinding does not remove, owing, to some extent, to coarse grains of grinding sand that mixed with finer...
sandwich holography
The simultaneous exposure of two holographic plates with emulsions facing the object. After deformation, a second pair of plates is exposed to the deformed object. The back plate of the initial pair...
SAP
stress-applying part
sapphire -> sapphire
Sapphire refers to a crystalline form of aluminum oxide (Al2O3) that is used in various optical and photonic applications due to its exceptional optical, mechanical, and thermal properties. Sapphire...
sapphire crystal
Sapphire crystal refers to a transparent, single-crystal form of aluminum oxide (Al2O3) known as corundum. It is one of the hardest known materials, second only to diamond on the Mohs scale of...
sapphire optical fiber
Sapphire optical fiber is a type of optical fiber made from single-crystal sapphire, which is a form of aluminum oxide (Al2O3) that is highly transparent in the infrared region of the electromagnetic...
sapphire window
A sapphire window refers to a transparent optical component made from sapphire crystal. Sapphire is a single-crystal form of aluminum oxide (Al2O3) that is highly prized for its exceptional optical...
sapphire
Sapphire refers to a crystalline form of aluminum oxide (Al2O3) that is used in various optical and photonic applications due to its exceptional optical, mechanical, and thermal properties. Sapphire...
SAR
synthetic aperture radar
SARISA
surface analysis by resonance ionization of sputtered atoms
SAS
self-alignment structure; single attachment station
SATA
serial advanced technology attachment
SATA-RAID
serial advanced technology attachment — redundant array of inexpensive discs
saticon
A direct-readout television pickup tube.
saturable absorber
A laser dye whose absorption coefficient drops at high levels of incident radiation. The phenomenon is often called bleaching.
saturation
1. The decrease of the absorption (or gain) coefficient of a medium near some transition frequency when the power of the incident radiation near that frequency exceeds a certain value. As long as the...
Savart plate
A double-plate device used to transmit polarized light and form interference fringes of the light, thus indicating its presence. It consists of two calcite plates of equal thickness, cut parallel to...
Savart polariscope
1. A polariscope consisting of a Savart plate and a tourmaline plate analyzer, and used to produce parallel color fringes by transmitting polarized light. 2. A polariscope composed of an analyzing...
SAW
surface acoustic wave
SAXS
small-angle x-ray scattering
sb
stilb
SBC
Soleil-Babinet compensator
SBD
Schottky-barrier diode

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