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Ohara Corp. - Optical Glass, Polish substrates 10-23

Meadowlark Optics - Wave Plates 6/24 MR 2024

8,726 terms

Photonics Dictionary

spiral scanning

A scanning process in which the greatest amount of radiation determines part of a spiral motion rotating in one direction.

splay -> deformation constant

Any of the constants that relate the tendency of the director to remain parallel to restoring torques throughout the media. The three constants of importance in liquid crystal displays are: splay --...

splice

A permanent joint whose purpose is to couple optical power among two or more ports. Also, a device whose purpose is to couple optical power between a waveguide and a source or detector.

splice closure

A container which secures multiple splice trays and protects the trays and their contents from damage.

splice loss -> insertion loss

The total optical power loss caused by the insertion of an optical component such as a connector, splice or coupler into a fiber optic system. See attenuation.

splice tray

A container that prevents spliced fibers from becoming damaged or being misplaced.

spline function

Potential alternative to the conventional pulse approximation method of digital image processing because of its highly desirable interpolating and approximating characteristics.

split field

The field of view seen through some types of coincidence rangefinders. It is formed by the juxtaposition of opposite halves of the images produced by two objectives, the half-images being separated...

split lens

A close-up lens, semicircular in shape, that is mounted in front of a conventional lens focused at infinity. The result is an image made up of two sections; one focused through the split lens on near...

split lens interference

The interference of the two real images formed by a Billet split lens.

split Stirling cooler

A cooling system used to attain and maintain desired low temperatures in infrared systems. The Stirling type is a mechanical refrigeration system capable of temperatures from 10 to 77 K.

split-beam laser interferometer

An instrument that divides a single laser beam in two and uses one half as a sensing beam and the other as a reference beam, then recombines the two and measures any phase shift between them. The...

split-crown triplet lens

A lens derived from the Cooke triplet anastigmat, but with one of the crown elements split in two, resulting in improved speed and correction of aberrations.

split-image microscope

A mask-alignment microscope used to produce and inspect microcircuits in the electronics industry. It provides flat-field, distortion-free images at all magnifications with a high-intensity vertical...

splitter

A passive fiber optic coupler that divides light from a single fiber into two or more fiber channels.

splitting ratio

A ratio expressing the difference in power between the output fibers of a coupler or splitter.

splitting uniformity

When splitting the output of a single optical fiber into two or more fibers, the difference in the maximum loss between any two channels.

SPM

scanning probe microscopy

spontaneous emission

Radiation emitted when a quantum mechanical system drops spontaneously from an excited level to a lower level. This radiation is emitted according to the laws of probability without regard to the...

spontaneous transition probability

The probability that an atom in one state will move spontaneously to a lower state within a given unit of time.

spot blocking

Blocking with a spotted tool.

spot diagram

A method of evaluating image quality whereby a large number of rays are traced through a lens from a single object point, and their intersections with the focal plane are plotted and analyzed.

spot filter

A neutral density filter that, when placed in front of the iris of a lens, increases the f-stop range.

spot meter

A telescopic light-sensing meter used to measure illumination levels of small regions at a distance of many feet; it is used in professional motion picture and television production to ensure proper...

spot photometer -> telephotometer

An instrument used to measure the luminance (brightness) of a distant object. The object is viewed through a small telescope, and a mirror in the focal plane reflects an internal illuminated surface...

spot-to-line converter -> section converter

An arrangement of optical fibers in a bundle whereby the geometric configuration of the input end differs from that of the output end without changing the total area; for example, a circular bundle...

spotted tool

A metal tool used to hold a number of lens blanks during grinding and polishing.

SPPCM

self-pumped phase conjugate mirror

SPR

surface plasmon resonance

spread function

The distribution of energy about the image of a point source in the focal plane of an optical system.

SPS

solar power satellite

SPSE

Society for Imaging Science and Technology

SPST

single pole/single throw

spurious resolution

A phenomenon that causes the details in an image to appear at a spatial frequency higher than that at which the contrast first drops to zero. A phase reversal will accompany this phenomenon, often...

sputtering

A vacuum deposition method in which the coating material (target) is removed from the surface of the coating source (cathode) by ion bombardment and deposited upon the substrates.

sputtering equipment

Sputtering equipment is machinery used in the process of physical vapor deposition (PVD), specifically sputtering. Sputtering is a method of depositing thin films of material onto a substrate surface...

sputtering target

A sputtering target is a solid material used in the process of physical vapor deposition (PVD), specifically sputtering. Sputtering targets are typically made of metals, metal alloys, or compounds...

SPW

surface-plasma wave

square

square wave

A wave that changes from one amplitude to the other in a short time compared with the wavelength.

SQUID

superconducting quantum interference device

SQW-GRINSCH

single-quantum-well, graded index separate confinement heterostructure

steradian

synchrotron radiation

SRAM

static random access memory

SRC

scratch-resistant coating

SRD

superradiant diode

SREM

scanning reflection electron microscopy

SRF

self-referenced fringe

SRS

stimulated Raman scattering

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Photonics Dictionary

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