Optical logic gates by nonlinear mixing in BBO

Christophe Moser; Demetri Psaltis

doi:10.1117/12.351055

23 June 1999 Optical logic gates by nonlinear mixing in BBO

Christophe Moser, Demetri Psaltis

Proceedings Volume 3609, Optical Pulse and Beam Propagation; (1999) https://doi.org/10.1117/12.351055
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

Abstract

An experimental demonstration of a set of optical logic gates (OR, XOR, AND) is shown using non-linear mixing in a BBO crystal. Pulses generated by a femtosecond Ti:Sapphire laser at 800 nm are split in 4 beams evenly separated in space and propagating collinearly. The 4 beams are focused by a singlet lens in the non-linear crystal and frequency doubled using a type I non-collinear phase matching. Due to spherical aberrations of the lens, the 2 beams that are far from the optical axis are brought into a focus that is slightly further away from the focus formed by the 2 beams closer to the optical axis. The frequency-doubled light generated by the two foci propagates in the same direction. An OR gate is produced by constructive interference of the frequency doubled pulses. A XOR gate is produced using destructive interference. OR and XOR can be programmed form a single gate by adjusting time delays of the inputs. We raise the possibility of creating a cascaded set of gates for a femtosecond time scale computing system using photoinduced absorption in polyacetylene substitutes.

Citation Download Citation

Christophe Moser and Demetri Psaltis "Optical logic gates by nonlinear mixing in BBO", Proc. SPIE 3609, Optical Pulse and Beam Propagation, (23 June 1999); https://doi.org/10.1117/12.351055

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