Patent ID: 7097315

Claim:
A reflector apparatus comprising: a reflector in the shape of a half-pyramid, constructed and arranged such that an incoming polarized beam passing through an entrance/exit surface of said reflector is reflected three times inside the reflector and leaves the same entrance/exit surface of said reflector with the direction of polarization being rotated, further including a prism reflector in the shape of a half-pyramid, which comprises: a transmitting surface in the shape of an isosceles right triangle ms entrance/exit surface; a first reflecting side surface, tilted 45 degrees with respect to said entrance/exit surface, crossing with said entrance/exit surface; a second reflecting side surface, perpendicular to said entrance/exit surface, crossing with said entrance/exit surface and the first reflecting side surface and a third reflecting side surface; and the third reflecting side surface, tilted 45 degrees with respect to said entrance/exit surface, crossing with said entrance/exit surface and the first reflecting side surface and the second reflecting side surface; wherein said apparatus is constructed and arranged such that an incoming polarized beam passing through the entrance/exit surface is reflected three times inside said apparatus and exits from said entrance/exit surface with the direction of polarization being rotated.