optical flat

noun

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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Meanings

nounoptical flat (plural optical flats)

plural optical flats

  1. engineeringA 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.
Cite this entry
APA

optical flat. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/optical%20flat

MLA

“optical flat.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/optical%20flat. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “optical flat,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/optical%20flat.

Source: optical flat on Wiktionary, CC BY-SA 4.0.