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Proceedings Paper

Optical logic gates by nonlinear mixing in BBO
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Paper 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.

Paper Details

Date Published: 23 June 1999
PDF: 8 pages
Proc. SPIE 3609, Optical Pulse and Beam Propagation, (23 June 1999); doi: 10.1117/12.351055
Show Author Affiliations
Christophe Moser, California Institute of Technology (United States)
Demetri Psaltis, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 3609:
Optical Pulse and Beam Propagation
Yehuda B. Band, Editor(s)

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