Abbe number

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Abbe number

[′ä·bə ‚nəm·bər]
(optics)
A number which expresses the deviating effect of an optical glass on light of different wavelengths.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The V-number of the fiber [V.sub.core], is given by:
When the V-number of the fiber falls below one, the optical field, which was originally contained in the core, spreads into the cladding.
An alternative means for creating tapers in the core without the external diameter of the fiber changing is to heat the fiber locally for some period of time so that the core diffuses from its original location out into the fiber.when this happens, that is, when the index of refraction of the core is decreased and the size is increased, the V-number stays roughly the same.
An alternative means for creating tapers in the without the external diameter of the fiber changing is to heat the fiber locally for some period of time so that the core diffuses from its original location out into the fiber.[6,20] When this happens, that is, when the index of refraction of the core is decreased and the size is increased, the V-number stays roughly the same.
This fiber sensor can be made to have variable sensitivity along its length.[28] The differential propagation constant in a two-mode fiber is directly dependent on the V-number. Tapering the E-core fiber changes the V-number as well as the sensitivity of the sensor along its length.