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Meadowlark Optics - Wave Plates 6/24 MR 2024

8,726 terms

Photonics Dictionary

tera (T)

In the SI system, prefix meaning 1012. (T).

terahertz radiation

Electromagnetic radiation with frequencies between 300 GHz and 10 THz, and existing between regions of the electromagnetic spectrum that are typically classified as the far-infrared and microwave...

terahertz spectrometer

A terahertz spectrometer is a scientific instrument used to measure and analyze the properties of materials in the terahertz frequency range, typically spanning from about 0.1 to 10 terahertz (THz),...

terahertz

Terahertz (THz) refers to a unit of frequency in the electromagnetic spectrum, denoting waves with frequencies between 0.1 and 10 terahertz. One terahertz is equivalent to one trillion hertz, or...

term coherence

A synonym for spatial coherence. See spatially coherent radiation.

terminated crossbar

An optical matrix that does not require perfection in both states of the crosspoint, so that all the optical switches can be tap-off devices in which a fraction of the optical energy is transferred...

termination

The process of attaching a device to the end of a fiber cable to enable the beam to be transmitted farther, to pass to another device and to avoid reflection.

ternary

Made up of three components; for instance yttrium, aluminum and garnet (YAG).

ternary notation

Refers to a notation system using a base of 3 and the numerical characters 0, 1 and 2.

terrestrial telescope

A telescope that produces an erect image. Erection is achieved either by a lens (for a long instrument) or a prism (for a compact instrument). Very small terrestrial telescopes of low power may be of...

tesla

The magnetic flux density given by a magnetic flux of one weber per square meter. (T).

tessar lens

test chart -> resolution target

A chart on paper or glass containing a series of sets of lines at progressively smaller spacing and used to ascertain the limiting number of lines per millimeter that an optical system is capable of...

test cube

A device used to detect elevation, pyramid and resolution errors in prisms and other components by bringing them into contact with the three highly polished, flat, perpendicular surfaces that form...

test glass

A transparent block shaped accurately to reverse curvatures of the components it is used to test. By contacting an accurately finished negative lens shape with a newly made positive, the conformity...

test pattern -> pattern

A device that determines the lens shape in the cutting or edging phase of fabrication. It also is used to denote the arrangement of markings on a reticle.

tetartohedral crystal

The section of crystal symmetry having only one-quarter of the greatest number of faces permitted by the crystal system of which the section is a member.

tetragonal

With respect to crystals, having three mutually rectangular axes, only two of which are equal.

tetrode

An electron tube that has an anode, a cathode, a control electrode and another electrode (usually a screen grid).

texel

A contraction for "texture element." A base unit used in computer graphics that defines the surface of three-dimensional objects. Texels are obtained from texture memory and represent color to be...

TF/TA

terrain following/terrain avoidance

TFD

time and frequency dissemination

TFEL

thin-film electroluminescent

TFF

thin-film filter

TFM

transverse field modulator

TFR

tightly folded resonator

TFT

thin-film transistor

TGG

terbium gallium garnet

TGS

triglycine sulfate

thallofide cell

A photoconductive cell that uses thallium oxysulfide as the light-sensitive medium.

thematic mapper

An instrument used to record infrared images of large areas. The recorded data are used to produce maps in false color indicating particular themes such as vegetation, cloud cover, temperature...

theodolite

A precise telescope set on a pair of rotation axes, the horizontal and vertical axes equipped with two divided circles. One circle measures horizontal angles and the other measures vertical angles....

thermal blooming

The effect that characterizes an intense laser beam that is passed through an absorbing medium, causing the absorbed energy to produce density changes that can alter the intensity distribution of the...

thermal detector -> infrared detector

An infrared detector is a device that is used to detect and measure infrared radiation, which lies beyond the visible spectrum of light. These detectors are utilized in various applications,...

thermal dissociation

A technique for detecting free radicals by their electronic spectra. The material to be studied is placed in a temperature-controlled furnace through which radiation is propagated onto a...

thermal imaging

Thermal imaging is a technology that detects infrared radiation (heat) emitted by objects and converts it into an image, known as a thermogram, which displays temperature variations in different...

thermal-infrared camera

A thermal-infrared camera, often referred to simply as a thermal camera, is a type of imaging device that detects infrared radiation emitted by objects due to their temperature. Unlike traditional...

thermal interface materials

Thermal interface materials (TIMs) are substances or compounds used to enhance the thermal conductivity between two surfaces in contact. These materials are primarily employed in electronic devices,...

thermal lensing

Distortion of an optical component as a result of heat, which can influence the divergence and the mode quality of a beam passing through the component.

thermal noise-limited operation

Operation in which the minimum detectable signal has its limits set by the thermal noise of the detector, the load resistance and the amplifier noise.

thermal photography -> thermal recording

A term referring to various processes for forming visible images outside of a camera to be photographed on ordinary film. Unlike regular infrared photography, thermal photography is an indirect...

thermal radiation

The emission of radiant energy in which the energy emitted originates in the thermal motion of the atoms or molecules of the source material.

thermal radiator

A source that emits radiant energy when its molecules or atoms are thermally excited.

thermal recording

A term referring to various processes for forming visible images outside of a camera to be photographed on ordinary film. Unlike regular infrared photography, thermal photography is an indirect...

thermal resistance

In a laser, a measure of the device's ability to dissipate internally generated heat.

thermionic diode

A diode electron tube that contains a heated cathode.

thermionic emission

The emission of free electrons by a rise in temperature of the cathode alone.

thermistor

A solid-state semiconducting structure (basically one of the bolometers) that changes electrical resistance with temperature. Materially, some kind of ceramic composition is used. A thermistor has...

thermochromic material

A material that changes color as it is heated or cooled.

thermocouple

A device composed of dissimilar metals that, when welded together, develop a small voltage dependent upon the relative temperature between the hotter and colder junctions. Banks of thermocouples...

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Photonics Dictionary

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