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In this work, we propose a novel method for continuous real-time measurementof the dynamics of the nonlinear refractive index n2. This is particularlyimportant for characterizing phenomena or materials (such as biologicaltissues, gases and other compounds) whose nonlinear behavior or structurevaries rapidly with time. The proposed method ingeniously employs two powerfultools: the spectral broadening induced by self-phase modulation and thereal-time spectral analysis using the dispersive Fourier transformation. Thefeasibility of the technique is experimentally demonstrated, achievinghigh-speed measurements at rates of several MHz.

Method for real-time measurement of the nonlinear refractive index