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Ohara Corp. - Optical Glass, Polish substrates 10-23

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

8,726 terms

Photonics Dictionary

center of curvature

The center of the sphere of which the surface of a lens or mirror forms a portion. Each curved surface of a lens has a center of curvature; the surfaces may be convex or concave.

center of perspective

That viewpoint at which the angular subtenses of points in the picture are identical to angular subtenses of the original points in the scene, at the camera lens.

center thickness

The lens thickness measured at the optical axis.

center, optical -> optical center

The point on the optical axis of a lens that is the image of the nodal points. For any bundle of rays passing through the optical center of a lens, the incident and emergent rays through this point...

centerburst

In an interferogram, an intense portion of the recording that corresponds in size to the amount of infrared radiation incident on the detector.

centered curve

The surface curvature designed to reduce the marginal error found in the periphery of a spectacle lens.

centered lens system

A lens system in which the centers of curvature of all surfaces fall on a common axis.

centering

1. Mounting a lens or mirror so that its optical axis is coincident with the optical or mechanical axes of other portions of the system. 2. The machining (edging) of the outside diameter of a lens...

centi

In the SI system, prefix meaning one hundredth, 10-2.

central obstruction

In a reflecting telescope, the obstruction of the primary mirror by a secondary mirror which blocks a small amount of the light reflected by the primary mirror and introduces additional diffraction.

central processing unit

The computer module whose circuitry interprets instructions and guides the actions of the peripherals. Also known as the mainframe.

centration

Centration is the precise alignment of the optical center of a lens or optical element with its mechanical center or the axis of the mounting assembly. It is crucial for ensuring that the optical...

centrifuge

A rotating chamber that can be spun at different speeds to generate great radial forces used to simulate different gravity loads.

centrifuge microscope

A microscope that can be used to observe and magnify microscope specimens while they are being centrifuged. The objective rotates near the periphery of the centrifuge head, and the ocular is...

centroid -> 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 at the intersection of all of the hyperplanes of symmetry within that...

CER

contactless electroreflectance

ceramics

In optics and photonics, ceramics refer to advanced ceramic materials that possess unique optical properties, making them suitable for various applications involving the manipulation and control of...

Cerenkov counter

An instrument that detects high-energy charged particles by analysis of the Cerenkov radiation that they emit.

Cerenkov radiation

The radiation produced when a charged particle traverses a medium that has a refractive index considerably greater than unity. The moving particle has a velocity that exceeds the velocity of light in...

cerium oxide

A polishing material that has a quicker polishing action than rouge (ferric oxide) and that is cleaner to handle.

CERN

European Organization for Nuclear Research

cesium 134

An isotope of cesium that emits negative beta particles and has a half-life of 2.19 years; its applications include photoelectric cells and developmental ion propulsion systems.

cesium chloride

Colorless crystals used in photoelectric cells and for photosensitive material in cathodes.

cesium oxide cell

A photoemissive detector sensitive to wavelengths up to 1 µm. It has one sharp maximum of sensitivity at 350 nm and a broad maximum at 800 nm.

cesium phototube

A phototube having a cesium-coated cathode that has its greatest sensitivity in the infrared region.

cesium vapor lamp

A lamp that emits light as the result of the passage of an electrical current through ionized cesium vapor.

cesium-antimonide photocathode

A photocathode that exhibits maximum sensitivity in the blue and ultraviolet regions of the spectrum. The sensitivity is obtained by the exposure of a thin layer of antimony to cesium vapor at an...

CEV

controlled environment vault

CFA

complex field amplitude

CFC

chlorofluorocarbons

CFF

critical fusion frequency

CFM

cubic foot per minute

CFR

code of federal regulation

centigram; center of gravity

CGA

color graphics adapter; Compressed Gas Association

CGC

color graphics converter

CGH

computer-generated hologram

CGHOE

computer-generated holographic optical element

CGHS

computer-generated holographic scanner

CGI

Computer Graphics Interface

CGM

computer graphics metafile

cgs

centimeter-gram-second

CGVH

computer-generated volume hologram

chain scission

The breakdown of the bonds in polymer chains caused by illumination.

chalcogenide

Chalcogenide refers to a class of compounds containing elements from group 16 of the periodic table, which includes sulfur (S), selenium (Se), and tellurium (Te). These elements are known as...

chalnicon

Proprietary name for a low-light-level TV pickup tube.

cham

chamfer

chamfer

The removal of sharp edges by grinding.

channel density

The number of channels per unit bandwidth handled by a single optical fiber.

channel electron multiplier

A photoelectric detector consisting of a glass tube internally coated with a low conductance material. Voltage applied along the tube causes photoemission from the photocathode at the end of the tube...

Photonics Dictionary

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