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Measurement of the nonlinear phase shift induced by cascaded interactions in a periodically poled lithium niobate
Carlo Liberale1, Vittorio Degiorgio, Marco Marangoni
1Dipartimento di Elettronica, Università di Pavia, 27100 Pavia, Italy. carlo.liberale@unipv.it
Abstract:
We report on the measurement of nonlinear phase shift phiNL induced by a strong pump at wavelength lamda p on a weak signal at lamda s 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 phiNL as a function of pump power and of wavelength difference lamda p - lamda s, is in good agreement with the theoretical predictions.
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