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Alluxa - Optical Coatings LB 8/23
geometric Dictionary Terms

keystone distortion
A type of geometrical distortion that brings about a trapezoidal display of a nominally rectangular picture. Usually...
decentering
1. The grinding or edging of a lens so that the geometrical center and optical center do not coincide. 2. The shifting of an...
grinding
The process in the manufacture of an optical system that gives it the required geometric shape.
direct laser interference patterning
Also called DLIP, a high-speed, high-resolution processing technique that uses high-power, pulsed laser systems to directly...
electromagnetic lens
An electron lens consisting of a homogeneous axial electric field and a magnetic field used in high-quality image tubes for...
figure tolerance
The allowable departure from the given figure or geometrical form. It may be described in terms of fringes or wavelengths.
crystal
A solid with a structure that exhibits a basically symmetrical and geometrical arrangement. A crystal may already possess...
beam matrix
1. A geometrical arrangement of two or more light beams for use in laser shows, object detection or other applications...
junction diode
A semiconductor device with the property of conducting current more easily in one direction than the other. It has two...
physical optics
The branch of science that treats light as a wave phenomenon wherein light propagation is studied by wavefronts rather than...
geometric concentration
 cladding mode
A mode that is confined by virtue of a lower-index medium surrounding the cladding. Cladding modes, in the terminology of...
etendue
A product of the area of a light beam (normal to its direction of propagation) and the solid angle that the beam includes;...
sag
1. In the geometric sense, an abbreviation for the term "sagitta,'' the height of a curve measured from the chord. ...
static beam shaping
A technique for creating optimal performance in a system by producing a specific beam irradiance distribution, usually...
extended source
A radiation source that, unlike the point source, can be resolved by the naked eye into a geometrical image.
ray
A geometric representation of a light path through an optical device; a line normal to the wavefront indicating the...
geometric extent
space pattern
On a test chart, the pattern designed to direct and measure geometric distortion.
mensuration
The process or act of measuring the geometric properties of an object or image.
coherent fiber bundle
A coherent fiber bundle (CFB), also known as a coherent fiber optic bundle, is an assembly of multiple optical fibers...
total insert
The lateral distance between a vertical line drawn through the geometrical center of the distance portion of a multifocal,...
geometric center
The physical center of the lens; it is on the axis of the lens, halfway between the front and rear vertex. It is sometimes...
figure
In optics, the geometrical form of an optical surface.
geometric operations
In image processing, mathematical operations that change spatial geometry, as for instance scaling, translating, rotating or...
total image runout
Image displacement by a decentered lens, rotated on a chuck whose axis of rotation passes through the geometrical center of...
optical extent
Mathematically defined as the product of etendue (or throughput) and the square of the refractive index, the optical extent...
optical encoder
A device designed to measure linear or rotary motion by detection of the movement of markings on a transparent medium past a...
platonic solid
Geometrical partition possible with a sphere that can be four, six, eight, 12 or 20 solid-angle wedges. Each platonic mass...
waveguide dispersion
For each mode in an optical waveguide, the term used to describe the process by which an electromagnetic signal is distorted...
image centroid
Often referred to as the geometric center of a given image or image plane, the centroid of an image is a fixed point located...
line source
In the spectral sense, an optical source that emits one or more spectrally narrow lines as opposed to a continuous spectrum....
meta-optics
Meta-optics, also known as metasurface optics or flat optics, is a branch of optics that involves the design, fabrication,...
geometric optics
A field of physics that deals with light as if it truly were composed of rays diverging in various directions from the...
aerotriangulation
In aerial photography, the geometric method of indicating the three-dimensional location of ground points from a pair of...
section converter
An arrangement of optical fibers in a bundle whereby the geometric configuration of the input end differs from that of the...
area concentration
The ratio of aperture area over receiving area for a specific lens. Also called geometric concentration.
prism
A prism is a geometric optical element with flat, polished surfaces that refract light. It is typically a solid, transparent...
inset
The horizontal distance between the 90° meridian of a bifocal lens and the geometrical center of the segment.
geometric phase shifting
A technique used to create an achromatic phase shift based on the principle of geometric phase. The phase shift is...
cutting center
The point on a cutting line that will become the geometrical center of the cut lens.
geometric image
The position and shape of the image of a point source, as predicted by geometric optics alone. The geometric image is to be...
reticle
A reticle, also known as a reticule or graticule, is a pattern or set of markings placed in the focal plane of an optical...
phluometry
The term applied to the geometrical structure of radiometry or of the propagation of any quantity that is conversed and that...
photogrammetry
Photogrammetry is a technique used to obtain accurate three-dimensional measurements of objects and environments through the...
leaky ray
In an optical waveguide, a ray for which geometric optics would predict total internal reflection at the core boundary, but...
polarization-preserving fiber
Single-mode fiber that preserves the plane of polarization of the light launched into it as the beam propagates through its...
photolithography
Photolithography is a key process in the manufacturing of semiconductor devices, integrated circuits, and...
fiber optic preform
A fiber optic preform is a cylindrical glass rod or tube used as the starting material for manufacturing optical fibers. It...
Geometrical optics
The area of optics in which the propagation of light is described by geometrical lines (or rays) governed by Fermat's...
optical path length
In a medium of constant refractive index, the product of the geometrical distance and the refractive index.
geometric metamerism
Metamerism that occurs when the geometry of illumination or viewing is changed.
optics
Optics is the branch of physics that studies the behavior and properties of light, including its interactions with matter...
crystal lattice
A regular, periodic, geometric array of points corresponding to the positions of the atoms in a perfect crystal.

(54 results found)

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