general/optical-quantities
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Optical cross section (1)
Spatial cutoff frequency (1)
Optical power (1)
Rayleigh distance (1)
Rayleigh length (1)
Etendue (1)
Beam divergence (1)
Optical cross section (1)
Optical cross section (1)
Optical cross section (1)
Optical power
Degree to which an optical system converges or diverges light
Rayleigh length
Concept in laser optics
Etendue
Measure of the "spread" of light in an optical system
Beam divergence
How much a beam expands as it travels