numerical aperture

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numerical aperture

[nü′mer·i·kəl ′ap·ə·chər]
(optics)
A measure of the resolving power of a microscope objective, equal to the product of the refractive index of the medium in front of the objective and the sine of the angle between the outermost ray entering the objective and the optical axis. Abbreviated N.A.

numerical aperture

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.
References in periodicals archive ?
technical characteristics of the local probe microscope (spm) in order to couple the spm to the raman spectrometer, Its configuration must make it possible to approach the probe with large numerical apertures (100x, Na 0.
Nikon's CFI 60 objectives offer the longest working distances and highest numerical apertures.
N-STORM is based on the world renowned Nikon Eclipse Ti research inverted microscope incorporating CFI60 objectives featuring high numerical apertures developed using unique optical design, coatings and manufacturing techniques.
It excels at correcting chromatic aberration and curvature of the field of view, plus it offers longer working distances and higher numerical apertures.
These points can be extremely small because the microscopic lenslets can have very short focal lengths while presenting reasonable numerical apertures.
ASPH aspheric lenses are diffraction limited, anti-reflection coated and available with numerical apertures ranging from 0.
25pm E95) enabling exposure of most critical features, allowing flexibility in optimizing catadioptric lens designs as well as support for ultra-high numerical apertures
The effect of laser bandwidth on critical dimensions (CD) becomes more significant with higher numerical apertures (NA) and shrinking process windows.
25pm E95) enables exposure of most critical features, allowing flexibility in optimizing catadioptric lens designs as well as support for ultra-high numerical apertures (NA greater than 1.
By enabling higher numerical apertures (NAs) at an enhanced depth of focus (DOF) compared to dry lithography, the resolution is improved over existing capabilities.
This resolution enhancement technique (RET) leverages the refractive qualities of the fluid to increase resolution by enabling higher numerical apertures (NAs) at an enhanced depth of focus (DOF) as compared to conventional lithography.
The Company's bend insensitive fibers are currently available in a 125 or 80 um clad diameter and can also be manufactured with higher numerical apertures for more demanding applications.

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