Limits of the capacity and density of holographic storage.

Previous research assessing planar holographic storage and cross talk between volume multiplexed holograms is reviewed. Using these results, we derive equations for volume holographic storage density and capacity. These equations permit us to identify and to calculate the trade-off between storage density and input-output parallelism and the dependence of capacity on both the parallelism and the resolution of the input-output path.

Generation of programmable coherent source arrays using spatial light modulators.

We demonstrate and characterize arrays of coherent focused spots generated by writing multiple Fresnel zone plates on optically and electrically addressed modulators. The programmable parameters of the array are its size (number of generated spots) and the transmissivity and focal length of each lens. As expected, phase modulators have a better conversion efficiency than amplitude modulators do.

Compact and robust incoherent holographic correlator using a surface-emitting laser-diode array.

A compact and robust holographic correlator using a vertical-cavity surface-emitting microlaser diode array is described. The system is based on the unique coherence property of the surface-emitting microlaser array: temporally highly coherent and spatially incoherent. The performance of the system is experimentally demonstrated, and the application of the system for neural network implementations is proposed.

Holographic implementation of a learning machine based on a multicategory perceptron algorithm.

An optical learning machine that has multicategory classification capability is demonstrated. The system exactly implements the single-layer perceptron algorithm and is fully parallel and analog. Experimental results on the learning by examples obtained from the system are described.