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Fiber Optics Beam Measurement

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Fiber Optics Beam Measurement

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A beam of light coming out of a small aperture diverges; this is related to basic wave physics, and in fact this applies to any wave. The angle of divergence is a function of the aperture size. It is often defined by numerical aperture, which simply means the sine of the half angle. The fiber itself is often specified by, among other things, its core diameter (typically tens of um).

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