Pump-probe interferometric measurement of nonlinear phase modulation in a GaAs/AlGaAs multiple-quantum-well waveguide

Abstract

Nonlinear refractive index measurements have been made at 1.06 μm using a time-division interferometer, and n2 measured to be about −3×10−17 m2 W−1 for a TM pump and TE probe. The refractive index change was also seen to contain a positive component at small pump-probe delay times, corresponding to an intensity-dependent nonlinear refractive index of n2≊2×10−17 m2 W−1.