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IEVref:731-01-36ID:
Language:enStatus: Standard
Term: beam divergence
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Definition: 1 – the increase in the cross section of a beam with increasing distance from the source

2 – in the far-field region, angle subtended by two diametrically opposed points in a plane perpendicular to the optical axis, at which points the irradiance is a specified fraction of the beam's peak irradiance

NOTE – Generally, only the maximum and minimum divergences (corresponding to the major and minor diameters of the far-field irradiance) need be specified.


Publication date:1991-10
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