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quarter-wave plate

From Wiktionary, the free dictionary

English

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Noun

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quarter-wave plate (plural quarter-wave plates)

  1. (physics) A sheet of birefringent material whose thickness is such that the light associated with the larger refractive index is retarded in phase by 90° with respect of that associated with the smaller refractive index; used to convert linearly polarized light into circularly polarized light.