Abstract
We describe a new femtosecond time division interferometry technique for characterizing nonlinear index changes from different components of the χ(3) tensor. Pump probe interferometric measurements of nonlinear phase are performed using a time division multiplexed reference pulse. The n2∥ and n2⊥ components of the nonlinear index are measured by permuting the polarizations of the pulses and using a novel differential detection and modulation scheme. Measurements are demonstrated in an optical fiber.
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