Search
Menu
Sheetak - Cooling at your Fingertip 11/24 LB
Photonics Marketplace
Suppliers Products
Handbook Institutions Dictionary

Show Filters
8,726 terms

Photonics Dictionary

radiograph
An x-ray or radium photograph illustrating the nonuniform density of the structure that the rays penetrate.
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.
radiophotograph
A photograph transmitted by radio waves.
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.
radiuscope
A microscope to which a beamsplitter and illuminated reticle have been added that is used to measure contact lenses.
radix
Total number of characters available to each position of a digital numeric system.
RAE
resistive anode encoder
RAI
random access integration
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...
RAM
random access memory
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 spectrometer laser systems
Raman spectrometer laser systems are specialized instruments used to perform Raman spectroscopy, a technique that provides information about molecular vibrations in materials. Principle of...
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...
range axis
The third dimension (depth or Z-axis) in an imaging system.
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.
RAS
remote active spectrometer
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.

Photonics Dictionary

Marketplace Help Need Help?

Explore Our Content
News
Features
Latest Products
Webinars
White Papers
All Things Photonics Podcast
Photonics Spectra Now
Videos
Our Summits & Conferences
Industry Events
Bookstore
Join Our Community
Subscribe
Advertise
Become a member
Sign in
Contribute a Feature
Suggest a Webinar
Submit a Press Release
Mobile Apps

About Us
Our Company
Our Publications
Contact Us
Career Opportunities
Teddi C. Laurin Scholarship

Terms & Conditions
Privacy Policy
California Consumer Privacy Act (CCPA)



©2024 Photonics Media
100 West St.
Pittsfield, MA, 01201 USA
[email protected]
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.