Crystal quartz plate with optical axis perpendicular to surfaces can rotate the plane of polarization of an input beam of light. The rotation angle at a particular wavelength is a function of thickness of crystal quartz. With particular thickness the quartz plates can rotate the plane of polarization of incident linearly polarized single wavelength of light by 45 or 90 degrees.
10 arc sec
Coating on both sides
R<0.25% @ design wavelength
Rotate Angle:45°, 90°,
Mounted Waveplates are available. (See Holder Size)