Abstract
A method for measuring complex fast nonlinear optical nonlinearities χ(3) in waveguides is demonstrated. It is based on a comparison between the optical nonlinearities of two different samples under identical experimental circumstances and thus is independent of laser pulse parameters. Heterodyne detected four-wave mixing is employed to achieve information about both amplitude and phase of χ(3). To increase the sensitivity, a procedure for suppression of the limiting parasitic signals due to the photodiode nonlinearity is suggested. Results obtained from a short piece of hollow-core photonic bandgap fiber are presented.
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