11 Feb 2009 Crystal Quartz, Diameter 25.4 x Thickness 1.0mm, 2.0mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm A retardation plate is an optically transparent material which resolves a beam of polarized light into two orthogonal components; retards the phase of one component relative to the other; then recombines the components into a single beam with new polarization characteristics. |