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22 terms
Photonics Dictionary: R
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e-beam x
R x
radially variable reflectivity optic
A reflecting optic whose reflectivity is a function of the radial distance from the optic axis; can be used to convert a Gaussian beam to one of uniform cross section.
radiuscope
A microscope to which a beamsplitter and illuminated reticle have been added that is used to measure contact lenses.
Raman shifter
A device that changes the frequency of light by inducing the Raman effect on a beam passing through it.
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...
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 range
In the region of a Gaussian beam focus by a diffraction-limited lens, it is the axial distance from the point of minimum beam waist (Wo) to the point where the beam diameter has increased to .
RBV
return beam vidicon
real holographic image
->
conjugate holographic image
Also known as real holographic image. The indistinct, highly distorted image produced on the side of the hologram closest to the observer, in addition to the primary image. When the location of the...
reconstructed image
An image that appears when a hologram is illuminated by a suitable light source, generally a laser beam.
reconstruction diffraction efficiency
Holographic quantity expressed as the ratio of the reconstructed first-order image to that of the incident reconstructing beam.
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.
reflecting galvanometer
A galvanometer having a small mirror that is mounted on a moving element and that reflects a light beam onto a scale.
remote active spectrometer
A device employed to identify toxic agents lingering on the ground or in the air from up to three miles away, by using laser beams to detect infrared light-absorption patterns that can be analyzed to...
remote laser welding
A robotic process commonly employed by automakers that enables high-speed and flexible production throughput by using swiveling optics for precise beam positioning.
residual absorption and scattering
Loss mechanisms that degrade the performance of all thin-film optical devices by removing radiant flux out of the specular beams.
retardation
The phase change of one of the two split beams of an interference microscope.
retardation plate
->
wave plate
An optical element having two principal axes, slow and fast, that resolve an incident polarized beam into two mutually perpendicular polarized beams. The emerging beam recombines to form a particular...
RIBE
reactive ion-beam etching
right-angle prism
A type of 45-90-45° prism used to bend a beam of light through a right angle with the surfaces forming the 90° angle acting as transmitting faces.
ring-laser gyroscope
A ring laser gyroscope (RLG) is a type of gyroscope that uses laser light to detect and measure changes in orientation. It operates based on the Sagnac effect, which is a fundamental principle of...
Risley prism
A Risley prism, also known as a Risley prism pair or Risley rotating prism, is an optical device used for controlling the direction of a laser beam or other optical beam by independently rotating two...
rotary laser
A structured light device using a rapidly rotating laser to project a beam of light that appears to the human eye as a continuous circle; used as a reference marker on walls or landscape for...
Photonics Dictionary
R
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