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Photonics Dictionary

VLP

video long play

VLSI

very large scale integration

velocity modulation

VME

virtual memory extension

VMM

vector matrix multiplication

VOA

variable optical attenuator

void

A blank area (caused by insufficient inking of the paper) that falls within the range of an intended character stroke in an optical character-recognition system.

Voigt effect

The induced birefringence in isotropic gases that results when the gases are placed in strong fields.

voltage contrast analysis

A nondestructive testing method for very large scale integration circuits, using a scanning electron microscope to monitor changes in the electronic state of the chip as it is fed test voltages while...

voltage multiplier

A device that converts alternating voltage to direct voltage, while at the same time increasing its amplitude.

voltaic cell

An electric cell having two electrodes of unlike metals immersed in a solution that chemically affects one or both of them, thus producing an electromotive force.

volume Bragg gratings

Volume Bragg gratings (VBGs) are specialized optical elements that consist of periodic variations in refractive index throughout the volume of a transparent material, typically a photosensitive glass...

volume hologram

A three-dimensional hologram.

volumetric imaging

Volumetric imaging refers to the capture, visualization, and analysis of three-dimensional (3D) information from a volume of space. Unlike traditional two-dimensional (2D) imaging, which provides...

vortex phase plate

A vortex phase plate is an optical device designed to impart a phase singularity, commonly referred to as a vortex or phase vortex, onto a light beam. This singularity results in a phase profile...

voxel

An element within a three-dimensional data set image.

VPE

vapor phase epitaxy

VPR

vapor phase regrowth

VPRF

variable pulse repetition frequency

vector quantization

variable reluctance; virtual reality

VRD

virtual retinal display

VRML

virtual reality modeling language

VRR

visual radio range

VSTEP

vertical to surface transmission electrophotonic device

VSWR

voltage standing-wave ratio

VTPR

vertical temperature profile radiometer

VTR

videotape recorder

VUV

vacuum ultraviolet

watt

w-type fibers -> double-clad fiber

Double-clad fiber (DCF) is a specialized optical fiber that features two concentric cladding layers surrounding a core. The design of double-clad fibers allows them to be used in various...

wide-angle

Wadsworth mounting

A system used for gratings that consists of a concave mirror, a grating and a plate holder mounted normal to the grating to reduce astigmatism and spherical aberration. The mounting yields a...

wafer

In the context of electronics and semiconductor manufacturing, a wafer refers to a thin, flat disk or substrate made of a semiconducting material, usually crystalline silicon. Wafers serve as the...

wafer tube

An image intensifier tube in which the photocathode and the output of the microchannel plate are proximity-focused on the microchannel plate input and output phosphor screen, respectively.

Waidner-Burgess standard

A standard of luminous intensity evaluated as the luminous intensity of 1 cm2 of a blackbody at the melting point of platinum.

WAN

wide area network

water glass

A solution containing colloidal silica particles.

watt

The power that gives rise to the production of energy at the rate of 1 joule per second.

wave

1. An undulation or vibration; a form of movement by which all radiant energy of the electromagnetic spectrum is estimated to travel. 2. A type of surface defect, usually due to improper polishing.

wave function

In quantum mechanics, a wave function (often denoted by the Greek letter Ψ, psi) is a mathematical description that represents the quantum state of a particle or a system of particles. It...

wave number

The frequency of a wave divided by its velocity of propagation; the reciprocal of the wavelength.

wave optics

Also referred to as physical optics - the area of optics in which the wave nature of light is essential when defining its propagation. To exploit the wave phenomena of light, one must interact light...

wave plate

An optical element having two principal axes, slow and fast, that resolve an incident polarized beam into two mutually perpendicular polarized beams. The emerging beam recombines to form a particular...

wave splitting

Any type of interference produced by a beamsplitter.

wave train

The continuous group of waves that persists for a short time only.

waveform analyzer

A device designed to measure the amplitude and frequency of the elements in a complex waveform.

waveform monitor

An oscilloscope used to survey the waveform of a video signal.

waveform

A waveform is a graphical representation of the shape and magnitude of a signal over time. It typically depicts how the amplitude (strength) of the signal changes over time, with time plotted along...

wavefront reconstruction -> holography

Holography is a technique used to capture and reconstruct three-dimensional images using the principles of interference and diffraction of light. Unlike conventional photography, which records only...

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Photonics Dictionary

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