Waveplates (retardation plates or phase shifters) are made from materials which exhibit birefringence. The velocities of the extraordinary and ordinary rays through the birefringent material varies inversely with their refractive indices. This difference in velocities gives rise to a phase difference when the two beams recombine.
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Half Waveplate
Quarter Waveplate
Dual Wavelength Waveplate
Cemented Zero Order Waveplate
Air Spaced Zero Order Waveplate
Ture Zero Order Waveplate
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