Optical metrology

Measure for measure

Keely Portway looks at some of the latest advances in light-based test and measurement techniques

Up to scratch?

Verifying the surface quality of optics has long relied on a visual, non-quantitative approach, finds Jessica Rowbury

A test for metrology

Aspheres and other freeform optics are becoming more commonly used in areas like consumer electronics - but, as these lenses move further away from rotational symmetry, can the metrology equipment to test them cope? Tom Eddershaw finds out

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