A birefringent filter based upon a new principle described in a theoretical paper by one of the authors has been constructed. The theory developed there has been verified experimentally in all respects. Limitatations on a filter of this type are discussed along with possible applications.
J. Katzenstein and S. Ward, "Realization of a New Type of Birefringent Filter," Appl. Opt. 10, 1119-1124 (1971)