Numerical Aperture (NA)

The Numerical Aperture of a fiber is defined as the sine of the half-angle of the light acceptance cone, relative to the fiber axis, in air.

CHI offers Numerical Apertures which range from 0.1 to 1.0. The values are determined by the core/cladding glass selection and defined by the glasses' refractive indices. This dependence is described by the following relationship,

where n = refractive index.




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