Measurement of the nonlinear phase shift induced by cascaded interactions in a periodically poled lithium niobate waveguide.
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.
Liberale
Carlo
C
Dipartimento di Elettronica, Università di Pavia, 27100 Pavia, Italy. carlo.liberale@unipv.it
Degiorgio
Vittorio
V
Marangoni
Marco
M
Galzerano
Gianluca
G
Ramponi
Roberta
R