An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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quarter-wave plate
  تیغه‌ی ِ چارک-موج  
tiqe-ye cârak-mowj
Fr.: lame quart d'onde  

A plate of doubly refracting material cut parallel to the optic axis of the crystal and of such a thickness that a phase difference of 90° is introduced between the ordinary and extraordinary rays for light of a particular wavelength. → half-wave plate.

See also: → quarter; → wave; → plate.