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CASTECH INC - High Precision CNC Polished Aspherical Lenses

Meadowlark Optics - Wave Plates 6/24 MR 2024

8,609 terms

Photonics Dictionary

sine wave response -> modulation transfer function

Also called sine wave response and contrast transfer function. The modulation transfer function is the ratio of the modulation in the image to the modulation in the object as a function of frequency...

sine wave target

Bar pattern represented as a sine curve in which the light distribution varies in one direction.

sine wave testing chart

A test chart whose luminance changes uniformly in one direction according to a sinusoidal rule. These charts carry groups of black lines on a white ground, the intensity profile across the lines...

single attachment station

In a dual-ring local area network, a node that is connected only to the primary, active ring and not to the secondary ring that provides a backup in case of cable or system failure.

single instruction/multiple data

A computer architecture used in parallel processing whereby the processing elements are directed by a single, central control unit; generally used for large numbers of relatively simple processing...

single molecule localization microscopy

Single molecule localization microscopy (SMLM) is a group of super-resolution microscopy techniques that surpass the diffraction limit of traditional optical microscopes, allowing for the...

single-beam gradient trap -> laser tweezers

A technique based on the principles of laser trapping and used to manipulate the position of small particles by gradually changing the position of the laser beam or beams once the particles are...

single-defect model

A model that predicts laser-induced damage to thin films caused by irradiation of identical, randomly distributed film defects.

single-line laser

A laser whose output is limited to a single wavelength.

single-mode waveguide (or fiber)

An optical waveguide in which only the lowest order bound mode, which may consist of a pair of orthogonally polarized fields, can propagate at the wavelength of interest.

single-molecule FRET

Single-molecule Förster resonance energy transfer (smFRET) is a specialized technique in biophysics and molecular biology used to study the distances and dynamic interactions between two...

single-molecule spectroscopy

An advanced technique that allows the detection of one molecule within a crystal or a cell through optical excitation. Single-molecule spectroscopy (SMS) can image at subwavelength scales, down to a...

single-photon avalanche diode

A single-photon avalanche diode (SPAD) is a specialized type of photodetector designed to detect extremely weak optical signals, down to the level of single photons. SPADs are widely used in...

single-photon emission computed tomography

A medical imaging method in which gamma camera heads rotate about the patient to detect radionuclides, enabling physicians to monitor functions within the body such as metabolism or blood flow.

single-photon-decay spectroscopy

A technique for observing the decay of light emissions from sources following their pulsed excitations, based on recording the arrival time of the first photoelectron after excitation. After many...

single-walled carbon nanotubes

Referred to as SWCNTs, these cylindrical nanostructures composed of a folded sheet of graphene can be used as near-infrared markers for small animal multiplex imaging. Emitting at different...

SIRS

satellite infrared spectrometer

sisyphus cooling

Sisyphus cooling is a technique used in atomic physics to achieve ultracold temperatures of atoms or molecules by exploiting the periodic motion of particles in optical traps or lattices. The name...

SIT

silicon intensifier target

skew angle

The angle at which photoelectric sensors are aligned to prevent light from being reflected back to the sensor from the object during retroreflective sensing; also, the angle a measured part is...

skew ray

Any ray through an optical system that is not a meridional ray. The plane created by a refracted skew ray does not contain the optical axis.

skiatron

A system employing a dark trace tube in which the opacity of the screen is varied as a function of the power of the beam.

skim

Streaks of dense seeds with accompanying small bubbles.

sky filter

A filter designed to decrease the luminosity of the sky without decreasing that of the landscape in the foreground. A filter that has a depth of tint that decreases from top to bottom is used in...

sky noise

Variations in signal detected on a bolometer that are caused by instabilities in the temperature of the sky.

skyrmion

A skyrmion is a topologically stable, vortex-like configuration of spins in a magnetic material. These configurations are characterized by a swirling pattern where the direction of the magnetic...

SLA

switching linear amplifier

slab interferometry

The method for measuring the index profile of an optical fiber by preparing a thin sample that has its faces perpendicular to the axis of the fiber, and measuring its index profile by interferometry.

slab laser

Solid-state laser geometry in which the standard rod is replaced by a slab of laser material. Often called total-internal-reflection face-pumped laser (TIR-FPL).

slab-dielectric waveguide

A waveguide with a rectangular cross section that is composed entirely of dielectric materials.

slab-off

The process of making an abrupt break in a spherical surface on a spectacle lens so that a new center of curvature is set for a portion of the lens. This has the effect of adding a prism to that...

SLAM

scanning laser acoustic microscope; simultaneous location and mapping

SLAR

side-looking airborne radar; single-layer antireflection

SLC

satellite laser communications; submarine laser communications

SLD

superluminescent diode

SLED

superluminescent light-emitting diode

sleek

A polishing scratch having no visible conchoidal breaking of the edges.

sleeve mount -> barrel

slicing and cutting machines - for crystals, quartz, glass, etc.

A crystal, glass, or quartz slicing and cutting machine is a specialized piece of equipment used in the manufacturing process to precisely cut and slice materials such as crystals, glass, and quartz...

slide projection lens

A lens designed for projection of color transparencies.

slide projector

An optical projection device designed to project positive color transparencies onto a screen for viewing.

sliding wedge -> measuring wedge

A wedge in a rangefinder or heightfinder used to displace the image produced by one telescope so that it coincides with that produced by the other telescope, thus affording a measurement of the...

slit

An aperture, usually rectangular in shape, with a large length-to-width ratio, and a fixed or adjustable shape through which radiation enters or leaves an instrument. The aperture is generally small...

slit-width error

The error inherent in spectral energy or spectrophotometric quantity due to the finite dimension of the entrance and exit slits.

SLM

single longitudinal mode; spatial light modulator

SLO

swept local oscillator

slow axis -> fast axis

In a birefringent material, the index of refraction varies with the direction of vibration of a lightwave. That direction having a low refractive index is the fast axis; at right angles to it is the...

slow-scan television

A television system that uses a slow rate of horizontal scanning to increase its reproduction and transmittance accuracy of printed matter, photographs and illustrations.

SLP

single linear polarization

SLR

single-lens reflex

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Photonics Dictionary