Hamamatsu Corp. - Mid-Infrared LED 11/24 LB

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Excelitas PCO GmbH - PCO.Edge 11-24 BIO HP

8,726 terms

Photonics Dictionary

reconstruction diffraction efficiency

Holographic quantity expressed as the ratio of the reconstructed first-order image to that of the incident reconstructing beam.

reconstruction wave

The coherent wave used to play back a recorded hologram. It is identical to the reference wave used in the generation of the original hologram; part of it is diffracted by the recording medium and...

recording camera

A type of camera that incorporates a tiny mirror that oscillates in accordance with incoming signals. An illuminated slit is imaged by this tiny mirror on a moving ribbon of sensitized paper or film,...

recrystallization

The growth of particular grain fragments in a metal or alloy, at the expense of others, that occurs when the metal or alloy is severely worked, as by cold rolling. Recrystallization results in...

rectangular scanning

A two-dimensional scanning process, in which a slow sector scan, propagated in one direction, is superimposed at right angles upon a rapid sector scan.

rectification

A technique used in photogrammetry to ensure parallelism during projection printing. Failure to do this will change a rectangular image on a negative into a trapezoidal image on the print.

rectilinear

In a straight line. When applied to a lens, it indicates that images of straight lines formed by the lens are not distorted.

rectilinear propagation

Straight line travel. This denotes the fact that light travels in a straight line when traveling through a medium with a constant refractive index.

rectilinear scanning

The scanning of a region in a given sequence of slender, straight parallel strips.

rectilinear system

An optical system that is corrected for distortion and spherical aberration and therefore forms the image of a straight line as a straight line.

RED

radian energy distribution

red, green, blue

RGB stands for red, green, blue, which are the primary colors of light used in additive color mixing. The RGB color model is widely used in various electronic displays, such as computer monitors,...

redshift

The displacement of spectrum lines, as determined by the increasing distance between, and the relative velocity of, the observer and a light source, causing the lines to move toward the red portion...

reduced focal length

The ratio of the first focal length of a lens to the refractive index of the medium containing the incident light; the ratio of the second focal length to the refractive index of the medium...

REE

rare earth element

reference beam

In holography, the beam of light that is directed from the beamsplitter to the recording medium, where it interferes with the object beam to generate the hologram.

reference point

The point of a chromaticity diagram that represents the chromaticity of a reference stimulus.

reference surface

The surface of an optical fiber that is used as a reference when joining optical fibers. Although the outermost cladding is usually used, the core cladding surface is also a common reference point.

reference white

The light from a nonselective diffuse reflector due to the standard illumination of the scene to be televised.

reflectance

The ratio of reflected flux to incident flux. Unless otherwise specified, the total reflectance is meant; it is sometimes convenient to divide this into the sum of the specular and the diffuse...

reflectance confocal microscopy

Reflectance confocal microscopy (RCM) is a non-invasive imaging technique that allows for high-resolution, in vivo imaging of biological tissues at the cellular level. It is particularly useful in...

reflectance estimate

The output of spectral channels written as an integral function of known solar irradiance, atmospheric transmittance and camera spectral responsivity, and the unknown spectral reflectance.

reflectance factor

Ratio of the directionally reflected flux to that reflected in the same direction by a perfect reflecting diffuser identically irradiated or illuminated.

reflectance spectrophotometer

An instrument that spectrally analyzes the flux reflected from a material. The reflected flux may be total, diffuse or specular. Often the instrument measures the reflectance factor instead of the...

reflected light meter

An exposure meter that indicates the amount of light reflected from the subject of interest.

reflected ray

The light ray leaving a reflecting surface, indicating the path of light after reflection.

reflected ultraviolet photography

A photographic method used to obtain an image of a subject by means of its reflectance of incident ultraviolet radiation. An ultraviolet source is used to irradiate the subject, while the reflected...

reflecting galvanometer

A galvanometer having a small mirror that is mounted on a moving element and that reflects a light beam onto a scale.

reflecting microscope

A microscope that uses a reflecting objective; often used with ultraviolet or infrared radiation.

reflecting objective

An image-forming system that uses mirrors rather than lenses. Such objectives are frequently used for astronomical telescopes and in ultraviolet microscopes.

reflecting prism

A prism having several plane polished surfaces, some to transmit light, some to reflect light, and some to serve both functions in succession. It acts generally as a group of plane mirrors held in a...

reflecting spectrograph

A solar spectrograph that uses long focus concave mirrors as its collimator and camera element.

reflecting telescope

A telescope that uses a reflecting objective to focus an image of a distant object at a focal point.

reflection

Return of radiation by a surface, without change in wavelength. The reflection may be specular, from a smooth surface; diffuse, from a rough surface or from within the specimen; or mixed, a...

reflection coefficient

Parametric measurement for elliptical fiber and cable expressed as a ratio of the two-directional flow of power through the cable at any chosen point.

reflection echelon

An echelon in which the dihedral angle between the faces of the groove is 90°.

reflection factor -> reflectance factor

Ratio of the directionally reflected flux to that reflected in the same direction by a perfect reflecting diffuser identically irradiated or illuminated.

reflection grating

A reflection grating is an optical component that consists of a series of closely spaced, parallel reflecting surfaces or grooves. These grooves are typically ruled or etched onto a flat substrate or...

reflection hologram

A hologram that is illuminated by a source from the viewer's side.

reflection reduction coating

The thin, transparent film made up of specific substances applied to glass-air surfaces for the purpose of decreasing the amount of reflected light.

reflection x-ray microscopy

A means of high resolution study through the application of soft and hard x-rays onto a sample surface in order to obtain image information from 1-10 nm layers and surfaces. The x-ray source emission...

reflective coating

Thin-film coating, single or multilayer, that is applied to a substrate to increase its reflectance over a specified range of wavelengths. Metal film, transparent or opaque, is the oldest form of...

reflective heat mirror -> diathermic mirror

A mirror coated to reflect cold (white) light while transmitting hot (infrared) energy.

reflective spectroscopy

Reflectance spectroscopy is a technique used to analyze the reflective properties of materials across various wavelengths of the electromagnetic spectrum. By measuring the reflectance of light from a...

reflective

The term reflective is an adjective that describes the ability of a surface or material to reflect light or other forms of radiation. It implies the capability of bouncing back or redirecting...

reflectivity

The ratio of the intensity of the total radiation reflected from a surface to the total incident on that surface.

reflectometer

An instrument for measuring reflectance.

reflector

A type of conducting surface or material used to reflect radiant energy.

reflector lamp

A lamp used in projection that is made with a reflector built into the bulb, normally by coating a portion of its interior with a reflective material to ensure the reflector's optimum position in...

refracted near-field scattering method -> refracted ray method

The technique for measuring the index profile of an optical fiber by scanning the entrance face with the vertex of a high numerical aperture cone and measuring the change in power of refracted...

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Photonics Dictionary

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