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395 terms

Photonics Dictionary: T

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TRIR

time-resolved infrared radiometry

tristimulus colorimeter -> colorimeter

A colorimeter is a device used to measure and quantify the color characteristics of an object or a light source. It provides objective and standardized color information, typically expressed in terms...

tristimulus integration

Computation of tristimulus values by integrating or summing, over the visible wavelength region, the product of the relative spectral power of a CIE standard source, the reflectance of the object...

tristimulus integrator

A device used to produce numerical integrations for colorimetry.

tristimulus values

The values of the three standard or matching stimuli necessary to provide a match with the light under trial, in a specified trichromatic system.

trochoidal mass spectrometer

A magnetic-deflection mass spectrometer that has an electrostatic field placed perpendicularly to its magnetic field, permitting both spatial mass dispersion and perfect double focusing in the plane...

troland

That level of retinal illuminance resulting when a surface with a luminance of 1 candela/m2 is viewed through a pupil with an area of 1 mm2.

true field

The size of the field of view in the object space of an optical system as differentiated from that in the image space (apparent field).

truing

The process by which a surface is made to conform accurately to a given curvature.

trunk

In a fiber optic communications network, a circuit that connects two switching centers and does not branch off to terminal points.

TTL

transistor-transistor logic

TTY

teletype

TUG

tunable ultraviolet generation

tunable laser

Any form of laser; e.g., a dye laser, having an output that can be adjusted over a wide range of wavelengths. Normally the range is about 70 nm wide.

tungsten lamp

An evacuated bulb containing a tungsten filament that is heated by passing an electric current through it. In domestic light bulbs the inside of the bulb is frosted to soften shadows. In projection...

tunnel luminescence

Light that is emitted from a phosphor film applied to the surface of a three-layer thin film, respectively metal, oxide and metal.

tunneling

An observed effect of the ability of certain atomic particles to pass through a barrier that they cannot pass over because of the required energy level, based on a law of quantum mechanics that...

tunneling mode -> leaky mode

In an optical waveguide, a mode whose field decays monotonically for a finite distance in the transverse direction but which becomes oscillatory everywhere beyond that finite distance.

tunneling ray -> leaky ray

In an optical waveguide, a ray for which geometric optics would predict total internal reflection at the core boundary, but which suffers loss by virtue of the curved core boundary.

turbidity

Turbidity is a measure of the cloudiness or haziness of a fluid caused by the presence of suspended particles. These particles can include sediment, silt, clay, plankton, and other microscopic...

turbulence propagation medium

Simulation of atmospheric turbulence for laboratory experimentation purposes, achieved by creating an unstable vertical gradient temperature in a tank filled with water.

turnkey system

A system that is complete and self-contained, needing no further additions to permit its operation.

turret

A rotating plate containing two or more lenses to provide a rapid interchange.

television

TVR

time variable reflectivity

TVRO

television receive only

twin crystal

A compound crystal having two or more crystals or crystal sections that, when regularly positioned, are in reverse position relative to the other sections. When viewed, these crystals appear to be...

twinning

A defect of natural quartz crystals in which both the right and left quartz are in the same crystal.

twist -> 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 --...

twisted intramolecular charge transfer

Twisted intramolecular charge transfer (TICT) is a phenomenon observed in certain organic molecules containing electron-donor and electron-acceptor groups that are linked together within the same...

twisted nematic phase

A form of liquid crystal widely used in displays, achieved by sandwiching a liquid crystal material between two substrates whose inside surfaces have been prepared with a special coating that aligns...

TWM

two-wave mixing

TWO

traveling wave oscillator

two-dimensional Fourier transform

The Fourier series representation of a two-dimensional periodic field, assuming that the original image is periodic both horizontally and vertically.

two-dimensional response kernel

Characteristic of an acousto-optic modulator, defined by the overlap integral of the incident light and sound field profiles; similar to a convolution operator.

two-photon excited fluorescence

Two-photon excited fluorescence (TPEF) is a nonlinear optical method that allows imaging of biological cells and living tissue. The advantage of TPEF in comparison to conventional fluorescence...

two-photon fluorescence

This results from the simultaneous absorption of two photons, each having half the energy needed for excitation and requiring a high spatial and temporal concentration of photons. The ensuing...

two-photon polymerization

Two-photon polymerization (TPP) is a technique used in additive manufacturing, specifically in the field of 3D printing. It involves using a focused laser to polymerize a photosensitive material in a...

two-six

Referring to compound semiconductor materials combining one element with two valence electrons and one or more with six. Examples include beryllium oxide and zinc selenide. (II-VI).

TWS

thermal weapons sight

TWT

traveling wave tube

Twyman-Green interferometer

A testing device that provides a contour map of the emergent wavefront for the observer in terms of the given wavelength of the light.

Tyndall cone

The form taken by scattered light, as a result of the Tyndall effect.

Tyndall effect

The effect by which sufficiently small particles will scatter blue light at right angles to the incident beam. This scattered light is completely linearly polarized.

type standards

A set of samples used in the analysis of multielement thin films.

Photonics DictionaryT

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