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numerical aperture |
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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.
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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. |
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