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- Beam_diameter abstract "The beam diameter or beam width of an electromagnetic beam is the diameter along any specified line that is perpendicular to the beam axis and intersects it. Since beams typically do not have sharp edges, the diameter can be defined in many different ways. Five definitions of the beam width are in common use: D4σ, 10/90 or 20/80 knife-edge, 1/e2, FWHM, and D86. The beam width can be measured in units of length at a particular plane perpendicular to the beam axis, but it can also refer to the angular width, which is the angle subtended by the beam at the source.Beam diameter is usually used to characterize electromagnetic beams in the optical regime, and occasionally in the microwave regime, that is, cases in which the aperture from which the beam emerges is very large with respect to the wavelength.Beam diameter usually refers to a beam of circular cross section, but not necessarily so. A beam may, for example, have an elliptical cross section, in which case the orientation of the beam diameter must be specified, for example with respect to the major or minor axis of the elliptical cross section. The term "beam width" may be preferred in applications where the beam does not have circular symmetry.".
- Beam_diameter wikiPageID "40780".
- Beam_diameter wikiPageRevisionID "602545947".
- Beam_diameter hasPhotoCollection Beam_diameter.
- Beam_diameter subject Category:Antennas_(radio).
- Beam_diameter subject Category:Optics.
- Beam_diameter type BodyPart105220461.
- Beam_diameter type Eye105311054.
- Beam_diameter type Optics.
- Beam_diameter type Organ105297523.
- Beam_diameter type Part109385911.
- Beam_diameter type PhysicalEntity100001930.
- Beam_diameter type SenseOrgan105299178.
- Beam_diameter type Thing100002452.
- Beam_diameter comment "The beam diameter or beam width of an electromagnetic beam is the diameter along any specified line that is perpendicular to the beam axis and intersects it. Since beams typically do not have sharp edges, the diameter can be defined in many different ways. Five definitions of the beam width are in common use: D4σ, 10/90 or 20/80 knife-edge, 1/e2, FWHM, and D86.".
- Beam_diameter label "Beam diameter".
- Beam_diameter sameAs m.0b54s.
- Beam_diameter sameAs Q4876179.
- Beam_diameter sameAs Q4876179.
- Beam_diameter sameAs Beam_diameter.
- Beam_diameter wasDerivedFrom Beam_diameter?oldid=602545947.
- Beam_diameter isPrimaryTopicOf Beam_diameter.