Abstract

A heterodyne readout technique for read-write holographic memory systems that reconstruct a virtual image wavefront is described and demonstrated. The conventionally recorded hologram is illuminated simultaneously with a suitable combination of temporally modulated reference and modified object waves for readout. The resulting enhancement of peak signal at the photodetector is 2τ0 (ηK)−1/2, where τ0 is the average amplitude transmittance of the hologram, K is the recording beam balance ratio, and η is the efficiency for conventional readout. Best performance is obtained for temporal phase modulation. The coupling of the illuminating wavefronts by the hologram is analyzed.

© 1973 Optical Society of America

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