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 ?
This system can provide a maximum numerical aperture, NA = 0.
The New Projection Lens of the 10iV provides optimum Numerical Aperture (NA)(*3) conditions for TSV and bump processes that require resolution from 1-50 microns with large aspect ratios.
The diameter of a laser light depends on the Numerical Aperture (NA) of the lens.
The XT:19x0 series includes the XT:1900Gi and XT:1950Hi systems, both featuring the industry's largest numerical aperture of 1.
Tenders are invited for Fiber Optic Setup for Numerical aperture.
With virtually all the same components as a conventional lithography setup, immersion lithography makes use of a liquid layer interposed between a lens and a silicon wafer's surface to improve resolution and increase the numerical aperture needed to effectively pattern features on the scale of 65-, 45-, and possibly 32-nm.
To help achieve a six to seven-fold increase in storage density over CD-R, two key components of the writing hardware needed to be altered: the wavelength of the recording laser and the numerical aperture (n.
With the aid of simple optics, the light from several mini laser bars can be coupled into a fiber with a core diameter of 200 om and a numerical aperture (NA) of 0.
0 [lambda] where [lambda] is the wavelength and NA is the numerical aperture of the lens.
The supply and in operation of a confocal laser scanning microscope, consisting of a fully motorized inverted microscope, lenses with high numerical aperture, a confocal scan head with at least three sensitive detectors, a detector for transmission of light, a minimum of 4 lasers with wavelengths between 405 and 633 lambda, incubation chamber for living cells and tissues, minimum 2 years of coverage for full service (both parts and working time).
ASML offers semiconductor manufacturers an extensive roadmap for further improvements to extend the success of KrF, including the introduction of the TWINSCAN XT:1000 with the ultimate dry numerical aperture of 0.
Its engravings reveal its three major functions: the first step of magnification (the large number), the resolving power of the microscope (related to the numerical aperture, immediately following the magnification value), and contrast (PH for phase contrast, HMC for Hoffman Modulation Contrast, or DIC or IK for Nomarski/ interference contrast).

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