(under subclass 350) Subject matter including an element which modifies the path of incident light so as to cause the light to repeatedly traverse the same or overlapping volumes of space.
(1) Note. The system generally includes plural reflectors to sequentially reverse the direction of the optical axis.
SEE OR SEARCH THIS CLASS, SUBCLASS:
495, for birefringent element beam deflection or splitting for polarization without modulation or external input.
