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- W2144861866 abstract "We report time-resolved studies of transient gratings in room-temperature GaAs/AlGaAs multiple-quantum-well structures made using a subpicosecond laser system. Forward-traveling and counterpropagating four-wave mixing geometries produced carrier modulation either parallel or perpendicular to the quantum wells such that the highly anisotropic carrier diffusion could be monitored. Carrier heating and cross-well transport was monitored and geometrical control of the diffusion and resulting four-wave mixing time constant demonstrated. Measured diffraction efficiencies gave the refractive-index change of the order of Δn ~ 0.02 at the onset of saturation of the heavy-hole exciton nonlinearity. Implications for refractive optical bistability are discussed through a determination of the limiting conditions for switching." @default.
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- W2144861866 date "1989-04-01" @default.
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- W2144861866 title "Transient grating studies of excitonic optical nonlinearities in GaAs/AlGaAs multiple-quantum-well structures" @default.
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- W2144861866 doi "https://doi.org/10.1364/josab.6.000567" @default.
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