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Excelitas PCO GmbH - PCO.Edge 11-24 BIO HP

8,726 terms

Photonics Dictionary

single scattering

SSC

superconducting supercollider

SSIS

solid-state image sensor

SSL

solid-state laser

SSM

stage scanning microscope

SSPD

self-scanned photodiode array

stokes

ST-LCD

supertwist liquid crystal display

stabilized light source

A light source that does not fluctuate despite temperature changes.

stabilizing platform

A platform mount used to hold sensitive optical instruments immobile.

stable multipass Fabry-Perot interferometer

A plane-parallel interferometer that yields extremely high contrast over a wide range of finesse values without significantly reducing transmission.

stable resonator

A laser resonator in which a mode oscillating between the mirrors will converge upon the laser's longitudinal axis.

stacked hologram

The superimposing of holographic pages in a thick, erasable storage material by changing the reference and object beams. This extends the capacity of holographic memories.

stacked optical memory

A memory system composed of a stack of holographic plates, a mode-locked laser and a rapid detector array. Ultrashort laser pulses are used to extract information from the stack. In this way, storage...

stacked-diode laser

A type of laser used when a great amount of power is required. Avoiding the bulk of large numbers of optical lenses, this instrument offers high-output intensity and a small emitting region at...

stadia scale

A reticle pattern in a surveying instrument consisting of parallel lines that can be superimposed on a calibrated rod, making possible determination of the distance from the instrument to the rod.

stadia surveying -> surveying instruments

Instruments used for measuring angles and occasionally lengths on the ground. The principal surveying instruments are the level, the stadia telescope, the transit and the theodolite. Laser...

stadimetry

The determination of distance based upon the known size of an object and the size of its image at the image plane of an optical system.

stage micrometer

In microscopy, a calibrated scale on a slide that may be viewed to determine the exact magnification factor of the microscope.

standard lens

A lens whose focal length is roughly equal to the diagonal of the negative format of the camera on which it is mounted.

standard refraction

The refraction that would take place in an idealized atmosphere where the refractive index is reduced uniformly with height at the rate of 39 x 10-6 per kilometer.

standard thermal profile

In infrared imaging systems used for mass screening of printed circuit boards or other quality control applications, an image of an ideal component that is stored in the system's memory and then...

standing wave

The combination of two waves having the same frequency and amplitude and traveling in opposite directions. Standing waves are indicated by a stationary set of nodes spaced one-half wavelength apart...

star coupler

A passive coupler that distributes signals from one or several inputs among a larger number of output waveguides arranged schematically as a star configuration.

star testing

The visual examination by a trained observer of the image of a point source. Any coloring or departure from the Airy disc rings indicates the presence of aberrations in the lens forming that image.

star topology

In local area networking, arrangement of the satellite nodes around a central node through which all routing of network data takes place.

staring sensor array -> mosaic detector array

A group of photosensors arranged in a grid-like pattern covering the entire field of view, enabling them to record it all at once (as a camera records an image on film) rather than by scanning parts...

Stark broadening

Spectrum broadening that results from the influence of an electric field.

Stark effect

The splitting or shifting of spectral lines or energy levels caused by the application of a strong transverse electrical field. It often is studied with a canal-ray tube that has a third electrode...

starting voltage

In a laser, the voltage necessary to initiate electrical discharge, somewhat higher than that needed to sustain it.

static beam alignment

The degree to which a laser beam is aligned parallel to the housing axis.

static beam shaping

A technique for creating optimal performance in a system by producing a specific beam irradiance distribution, usually through the use of geometric optics. A common design involves the use of ray...

static electricity -> electrostatic charge

The effect produced by electrical charges or fields alone, without interaction with magnetic influence.

static fatigue

The application of a constant stress to an optical fiber.

STC

Science & Technology Center

std

standard

steady-state condition -> equilibrium mode distribution

The condition in a multimode optical waveguide in which the relative power distribution among the propagating modes is independent of length.

stealth

That characteristic which makes a weapon system less visible to radar, optical, acousto-optic, infrared and other military sensors.

STED microscopy

STED microscopy, or stimulated emission depletion microscopy, is a superresolution imaging technique in fluorescence microscopy that surpasses the diffraction limit, enabling the visualization of...

Stefan-Boltzmann law

The formula that indicates the total radiation at all wavelengths from a perfect blackbody. W Total = 5.67 x 10-12 T 4(W/cm2)

stellar interferometer -> Michelson stellar interferometer

An interferometer constructed to be positioned on a telescope to measure the angular separation of the components of double stars.

stellar parallax

The angle subtended by the mean distance of the Earth from the sun at the distance of a given star from the sun.

stellar photometry

The utilization of photometric measurement to determine the relative magnitudes of the heavenly bodies.

STEM

scanning transmission electron microscope

stencil CRT image generation

The projection of the image beam by a cathode-ray tube through a mask, where it is deflected through the suitable character position in the mask and then deflected by another system to its suitable...

step index fiber

An optical fiber in which the core is of uniform refractive index.

step index profile

A profile of an optical component, usually a fiber, in which the core is of uniform refractive index and the cladding or surrounding optical surface of a different, usually lower, index.

step response

The observed time dependence of the transmittance of a step of radiation through a given medium.

step tablets

In sensitometric testing, a series of areas progressing by equal density steps (usually the increments between steps are equal to the logarithm of the square root of two). They are commonly used in...

step-and-repeat camera

A type of camera that has scales or other arrangements by which successive exposures can be lined up and equally spaced on a sheet of film. It is used in the preparation of microfiche copies of...

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Photonics Dictionary

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