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numerical aperture

   Also found in: Dictionary/thesaurus, Medical, Acronyms, Wikipedia, Hutchinson 0.01 sec.

The measurement of the acceptance angle of an optical fiber, which is the maximum angle at which the core of the fiber will take in light that will be contained within the core. Taken from the fiber core axis (center of core), the measurement is the square root of the squared refractive index of the core minus the squared refractive index of the cladding. See critical angle and fiber optics glossary.

The Acceptance Angle
The numerical aperture measures the acceptance angle of a fiber.
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By using a lens with the same numerical aperture as current DVD drives, the HD-DVD format ensures backward-read compatibility with current DVD and even CD media, utilizing its simplified design.
DVD update: from double layers to blue lasers by D'Ambrise, Rich / Computer Technology Review
The NIST transfer standard, developed as part of an ongoing effort to provide lower uncertainty for OFPM calibrations, has a coupling efficiency very near unity up to a numerical aperture (NA) of 0.
NIST researchers complete international intercomparison of optical ... by Journal of Research of the National Institute of Standards and Technology
Developed for volume production applications, the 300mm TWINSCAN AT:1100 is a 193nm wavelength system with the industry's highest numerical aperture ArF lens.
ASML SELECTS 300MM TWINSCAN AS SINGLE PLATFORM AT 193NM WAVELENGTH by EDP Weekly's IT Monitor
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