Optimax Systems, Inc. - Optical Components & Systems 2024 LB

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Photonics Dictionary: R

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radiographic amplifier screen

A solid-state panel of the photoconductor-electroluminescent type. The photoconductive layer, sensitive to x-rays, is coated by the electroluminescent, which gives the visible image. When the former...

radiography

A photographic process using x-ray radiation or the g-rays of radioactive materials.

radiology

The study of radioactive substances and high-energy radiations such as x-rays and g-rays.

radioluminescence

Luminescence produced by the bombardment of radiant energy such as x-rays, radioactive waves or alpha particles.

radiometallography

The analysis, by x-rays, of the crystalline structure and other properties of metals and alloys.

radiometer

A device used to measure the intensity of radiant energy.

radiopaque

Incapable of being penetrated by any form of radiation.

radioparent

Capable of being penetrated by some form of radiation.

radiophotography

The transmission of photographic images or pictures by radio waves.

radiophotoluminescence

The luminescence displayed when particular minerals are irradiated with β-rays and g-rays, after being exposed to nuclear radiation.

radius tool

A metal device of convex or concave curvature to which lens castings or semifinished lenses are cemented with only their edges in contact with the device.

radix

Total number of characters available to each position of a digital numeric system.

rail -> optical bench

A support for optical parts comprising a solid bed that permits precise longitudinal movement of one component relative to the others, and a number of sliders equipped with holders for lenses, lamps,...

rainbow hologram

Essentially, a hologram of a hologram, in which the first-generation hologram is masked with a narrow slit. During image reconstruction, the slit operates as the exit pupil in image space. The...

Raman absorption

The absorption of part of the photon energy by a molecule through which there is a slight energy change and the energy balance moves on.

Raman fiber probe

A flexible fiber cable with a small diameter that transports light from the excitation laser to the target. Used in Raman spectroscopy, the probe is capable of obtaining high-quality data at high...

Raman laser -> Raman scattering

Raman scattering, also known as the Raman effect or Raman spectroscopy, is a phenomenon in which light undergoes inelastic scattering when interacting with matter, such as molecules, crystals, or...

Raman scattering -> Raman scattering

Raman scattering, also known as the Raman effect or Raman spectroscopy, is a phenomenon in which light undergoes inelastic scattering when interacting with matter, such as molecules, crystals, or...

Raman scattering

Raman scattering, also known as the Raman effect or Raman spectroscopy, is a phenomenon in which light undergoes inelastic scattering when interacting with matter, such as molecules, crystals, or...

Raman shifter

A device that changes the frequency of light by inducing the Raman effect on a beam passing through it.

Raman spectroscopy

Raman spectroscopy is a technique used in analytical chemistry and physics to study vibrational, rotational, and other low-frequency modes in a system. Named after the Indian physicist Sir C.V. Raman...

Ramsden circle -> exit pupil

In a lens or other optical system, the image of the aperture stop as seen from image space.

Ramsden eyepiece

An eyepiece consisting of two planoconvex lenses of the same focal length, with facing convex surfaces.

random access multiphoton microscopy

Also known as RAMP microscopy, random access multiphoton microscopy is a microscopic technique that uses multiple acousto-optic modulators to enable faster and addressable scanning of 3D cellular...

random noise

Essentially, noise that cannot be predicted. Therefore, even if the magnitude of sound or oscillation in a system is known at a given moment, random noise can change in a short time.

randomized fiber optic cable

Fiber optic cable in which the arrangement of fibers within the bundle has been made random so that output light will be uniformly distributed and not relay the image of the light source at the input...

rangefinder

1. An optical distance finder that depends on triangulation of two convergent beams on an object from disparate view points. 2. A device that depends on the measurement of time of wave travel from an...

rapid access system

A photographic camera and processing system used to form a usable record of the subject in a short time, usually a few seconds, for immediate analysis.

rapid rectilinear lens

A double meniscus system in which two achromatized meniscus lenses are arranged symmetrically on either side of the aperture stop, reducing or eliminating distortion, coma and lateral color.

rare earth dopants

Rare earth dopants refer to elements from the lanthanide series, also known as rare earth elements, that are intentionally introduced into the crystal lattice of a material to modify its properties....

rare gas halide laser -> excimer laser

An excimer laser is a type of ultraviolet laser that emits short pulses of light in the ultraviolet spectrum. The term excimer is derived from excited dimer, reflecting the nature of the gain medium...

rare-earth doped fiber

An optical fiber in which ions of a rare-earth element, such as neodymium, erbium or holmium, have been incorporated into the glass core matrix, yielding high absorption with low loss in the visible...

rare-earth elements

Rare-earth elements (REEs) are a group of seventeen chemical elements found in the Earth's crust, characterized by their unique properties and scarcity relative to other elements. Despite their name,...

rare-earth type glass

Optical glasses containing the oxides of rare earths such as lanthanum to impart a very high refractive index combined with a low dispersive power.

rarefaction

In a gas, the temporary drop in density caused by contact with a sound wave.

raster

The pattern of lines traced by rectilinear scanning in display systems.

raster image processor

In imaging technology, a device that converts raster or line-scan data to pixel form for further processing.

raster scan display

A display in which regeneration takes place serially at a fixed speed in a set pattern through the scan lines.

Raster scanning

Raster scanning is a technique used in imaging and scanning systems to systematically capture and process information from a two-dimensional area or surface. It involves moving a sensor or scanning...

raster unit

The vertical or horizontal distance between two addressable points on a display screen; indicates the basic resolution element of a terminal.

ratiometer

An electronic device that minimizes short-term drift effects and random measurement error inherent in alternate ellipsometric measurement of two signals.

ratiometry

Ratiometry is a technique used in various scientific fields, particularly in analytical chemistry and biochemistry, to measure concentrations or quantities by comparing the intensity of two different...

raw glass

A term that describes any state of glass before its manufacture as an element.

ray

A geometric representation of a light path through an optical device; a line normal to the wavefront indicating the direction of radiant energy flow.

ray intercept plot

A graph of the intersections of a fan of rays with the final image plane, plotted as a function of the positions of the rays in the pupil of the system.

ray tracing

Ray tracing is a rendering technique used in computer graphics to simulate the way light interacts with objects in a scene. It involves tracing the path of rays of light as they travel through a...

Rayleigh criterion of resolving power

When a lens system with a circular aperture is free of aberrations, the image of a point object will appear as a disc of finite size surrounded by concentric rings. When two points are separated such...

Rayleigh interferometer

A device that is used to determine the index of refraction of a gas or liquid through the interference patterns formed by two beams of light, one of which has been transmitted by the sample. A single...

Rayleigh limit

The restriction of wavefront error to within a quarter of a wavelength of a true spherical surface to assure essentially perfect image quality.

Rayleigh line

That element of a spectrum line in scattered radiation having a frequency equal to that of the corresponding incident radiation, due to ordinary or Rayleigh scattering.

Photonics DictionaryR