Abstract

We have demonstrated for the first time a fully functional holographic disk system using shift multiplexing. The architecture of our system is similar to the compact disc, but with higher storage density and data transfer rate. Figure 1 shows the experimental setup. An amplitude data mask containing 590,000 random bits (pixels) is imaged to the detector plane by a pair of Nikon F/1.4 50mm camera lenses. A 120mm glass substrate coated with a holographic recording medium (DuPont's HRF-150 100 micron thick photopolymer) is placed slightly after the Fourier plane of the camera lenses. The photopolymer disk is rotated by a microstepping motor capable of 125,000 steps per revolution. A F/1.4 CCD camera lens is used to create the spherical reference beam necessary for shift multiplexing [1]. The stored data is retrieved by a CCD camera placed at the detector plane.

© 1996 Optical Society of America