Dispersion (physics) | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Dispersion_(optics)


00:01:50 1 Examples
00:02:41 2 Material and waveguide dispersion
00:03:59 3 Material dispersion in optics
00:05:26 4 Group and phase velocity
00:06:20 5 In waveguides
00:08:22 6 Higher-order dispersion over broad bandwidths
00:16:57 7 In gemology
00:19:21 8 In imaging
00:20:44 9 Pulsar emissions
00:22:18 10 See also
00:23:35 11 References
00:24:17 12 External links



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SUMMARY
=======
In optics, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency.Media having this common property may be termed dispersive media. Sometimes the term chromatic dispersion is used for specificity.

Although the term is used in the field of optics to describe light and other electromagnetic waves, dispersion in the same sense can apply to any sort of wave motion such as acoustic dispersion in the case of sound and seismic waves, in gravity waves (ocean waves), and for telecommunication signals along transmission lines (such as coaxial cable) or optical fiber.

In optics, one important and familiar consequence of dispersion is the change in the angle of refraction of different colors of light, as seen in the spectrum produced by a dispersive prism and in chromatic aberration of lenses. Design of compound achromatic lenses, in which chromatic aberration is largely cancelled, uses a quantification of a glass's dispersion given by its Abbe number V, where lower Abbe numbers correspond to greater dispersion over the visible spectrum. In some applications such as telecommunications, the absolute phase of a wave is often not important but only the propagation of wave packets or "pulses"; in that case one is interested only in variations of group velocity with frequency, so-called group-velocity dispersion.