Abstract

An optical system that performs sequential binary logic operations is described. The system consists of a spatial light modulator (SLM) used to provide a nonlinear threshold response and a computer-generated hologram to provide interconnections between logic gates. A 2-D array of logic gates with binary inputs and outputs is formed on the active surface of the SLM. These gates are interconnected by a 2-D array of subholograms, one for each gate. Arbitrary logic circuits consisting of NOR gates and inverters can be implemented, and the system can be reconfigured by changing a single holographic element. The system is demonstrated using a twisted-nematic liquid crystal light valve as the SLM. A test circuit is implemented that includes a synchronous master–slave flip-flop and an oscillator consisting of five inverters in a feedback loop. Experimental results of this test circuit are presented.

© 1984 Optical Society of America

Optical flip-flops and sequential logic circuits using a liquid crystal light valve

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