Retroreflective Phase Retardation Prisms.
ELECTRONICS RESEARCH LAB ADELAIDE (AUSTRALIA)
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A retroreflecting device with controlled phase retardation can be made by coating each reflecting surface of a porro prism with a single dielectric film. The amount of phase retardation is a function of the refractive index of the prism, the refractive index of the film and the film thickness. The retardation introduced can be readily controlled in the range of zero to pi radians using readily available materials. The materials used are not birefringent. Two phase retardation prisms have been made and evaluated. Author