Abstract
We show how photorefractive two-wave mixing allows a nonlinear input-output response providing computational abilities of decision. Particularly, we investigate the realization of a photorefractive “optical neuron”. Signal binarization is obtained together with an amplification that can compensate for the losses due to holographic connections. Moreover, the treatment of bipolar signals is allowed by preserving the phase of the wave in a coherent situation. Experimental evidence, using a crystal of BaTiO 3 is presented.
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