quarter-wave plate


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quarter-wave plate

[′kwȯrd·ər ‚wāv ¦plāt]
(optics)
A thin sheet of mica or other doubly refracting crystal material of such thickness as to introduce a phase difference of one quarter-cycle between the ordinary and the extraordinary components of light passing through; such a plate converts circularly polarized light into plane-polarized light.
References in periodicals archive ?
Manmade quarter-wave plates perform this essential function in CD and DVD players and in circular polarizing filters for cameras.
The optical system for the measurement of retardation, which is similar to the one reported in a patent [10], is composed of a He-Ne laser light source, polarizing filters, quarter-wave plates, a rotating polarizing filter, a beam splitter, a beam expander, and photo detectors.
For a perfect quarter-wave plate these are related to [delta] and [psi] by the eq (2)
If the compensator is not a perfect quarter-wave plate, the relationships are