Transient nonlinear optical properties of δ-doped asymmetric superlattices measured by picosecond electro-optic sampling

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Abstract
We have performed the first picosecond time‐resolved measurements of the photorefractive and nonlinear absorptive properties of asymmetric GaAs doping superlattices. The lack of inversion symmetry in these structures results in a net photoinduced electric field and, therefore, photorefractive phenomena via the χ(2) of the material. Using the electro‐optic sampling technique, the temporal behavior of the photorefractive, and nonlinear absorption effects are uniquely determined. We have observed peak refractive index changes of 3.8×10−4 at an energy density of 40 fJ/μm2.