Abstract
The cube-corner retroreflector, an optical element consisting of three orthogonal mirrors, reflects incident beam in the exactly opposite direction. The change in the polarization state of the infrared beam, reflected from CCR constructed of three metal surfaces with complex reflexion coefficient, is discussed theoretically with ray tracing and the Jones matrices formalism. It is found that the final polarization state is modified according to the angle of incidence, the ray path through the retroreflector as well as the beam wavelength and its initial polarization. The main point is that under the specified conditions polarization changes could be minimized, what is essential for the CCR practical application at tokamak polarimetric systems.
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