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Nonlinear directional coupler in periodically poled lithium niobate
Authors:Schiek R  Friedrich L  Fang H  Stegeman G I  Parameswaran K R  Chou M H  Fejer M M
Institution:School of Optics and Center for Research and Education in Optics and Lasers, University of Central Florida, 4000 Central Florida Boulevard, Orlando, Florida 32816-2700, USA.
Abstract:Nonlinear wave propagation was investigated experimentally in coupled waveguides by means of the cascaded nonlinearity in quasi-phase-matched second-harmonic generation. With a specially designed wave-vector-mismatch distribution along the propagation axis, cascading was optimized for low fundamental depletion. High-contrast, ultrafast all-optical switching with switching powers of tens of watts was observed.
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