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Optical flat

Related Terms:

quartz microfinish glass ground surface quality polished deviation flatness interferometer nanometer

Noun

Definition: A disk of high-quality quartz glass having at least one side ground and polished with a deviation in flatness less than 50 nanometers all over, and a surface quality of 5 microfinish or less; used, in an interferometer, to measure the flatness of other surfaces.

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