Abstract: A single-crystal polygonal polarization prism has at least two pairs of mutually parallel prism planes. The prism is characterized by the fact that the e-beam is reflected within the prism with even number of reflections, whereby after the exit from the prism the angular position of the e-beam does not depend on the wavelength. The o-beam is subjected to at least one reflection, and the angular position of o-beam also does not depend on the wavelength. The prism of the invention does not distort the cross sections of the beams and is characterized by minimal optical losses.