Abstract

We report on the measurement of nonlinear phase shift ϕNL induced by a strong pump at wavelength λp on a weak signal at λs through a cascade of two second-order interactions in a periodically poled lithium-niobate waveguide. The experiment is performed by use of an interferometric scheme especially designed to be insensitive to slow mechanical and thermal drift effects. The observed behavior of ϕNL as a function of pump power and of wavelength difference λpλs is in good agreement with the theoretical predictions.

© 2005 Optical Society of America

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