We describe four-facet volume phase-transmission holograms made with D
uPont photopolymer. The holograms implement light-efficient two-dimens
ional perfect shuffles based on a one-copy algorithm previously descri
bed by us [Appl. Opt. 31, 5464-5467 (1992)]. We have improved the real
diffraction efficiency of these facet holograms to 65.5%, and we have
improved the geometrical accuracy of the output over previous impleme
ntations by changing the experimental setup and the orientation of the
hologram. We describe the procedures for making the holograms and giv
e experimental results.