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We propose the use of KTP-based waveguides for all-optical switching. The passing of subnanosecond light pulses through an Rb:KTP nonlinear directional coupler is investigated. The nonlinear switching of 40% of light power from the one channel to the other is observed at 5 kW input power.
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K. S. Buritskii, Eugeni M. Dianov, Vyacheslav A. Maslov, V. A. Chernykh, Ivan Alexandrov Shcherbakov, "Nonlinear directional coupler based on Rb:KTP waveguides," Proc. SPIE 1932, Guided-Wave Optics, (14 May 1993); https://doi.org/10.1117/12.145586