numerical aperture

(redirected from Numerical apertures)

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 ?
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.
With an emission wavelength of 193 nm and a repetition rate of 6,000 Hz, the GT61A is designed for next-generation lithography tools with numerical apertures of 1.
ASPH aspheric lenses are diffraction limited, anti-reflection coated and available with numerical apertures ranging from 0.
Nikon's CFI objectives excel at correcting both chromatic aberration and curvature of the field of view, plus feature longer working distances and higher numerical apertures.
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 system uses Nikon's most acclaimed CF160 infinity objectives both oil immersion and dry types, which deliver excellent resolution with high numerical apertures and long working distances.
The effect of laser bandwidth on critical dimensions (CD) becomes more significant with higher numerical apertures (NA) and shrinking process windows.
The C1 System incorporates the CFI60 Optical System, designed to achieve higher numerical apertures, longer working distances, and correct for axial and lateral chromatic aberration in the objective and tube lens.
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.
Nikon's TE2000E2 also incorporates Nikon's CFI60 optical system, offering research professionals the brightest, highest contrast, aberration-free microscope imaging at both the highest and lowest magnifications, with notably longer working distances and higher numerical apertures.

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