HOLOGRAPHIC STARS

Holographic stars fabricated on DuPont's holographic recording film HR F 600X010 by the use of He-Ne laser light are demonstrated. The stars operate with plane waves, the transmitted portions of the input beams are used at the corresponding outputs, and the gratings are in the vol ume regime of diffraction. Multiple exposure based on the Bragg degene racy effect is employed, which drastically reduces the number of multi plexed gratings and requires a three-dimensional arrangement of the re play beams. The star operates at different wavelengths only by the rea djustment of the Bragg angles.