Transient Grating Studies Of Excitonic Optical Nonlinearities In Gaas/Algaas Multiple-Quantum-Well Structures
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. © 1989, Optical Society of America.
Journal of the Optical Society of America B: Optical Physics
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Miller, A.; Manning, R. J.; and Milsom, P. K., "Transient Grating Studies Of Excitonic Optical Nonlinearities In Gaas/Algaas Multiple-Quantum-Well Structures" (1989). Scopus Export 1980s. 318.