Title

Transient Grating Studies Of Excitonic Optical Nonlinearities In Gaas/Algaas Multiple-Quantum-Well Structures

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. © 1989, Optical Society of America.

Publication Date

1-1-1989

Publication Title

Journal of the Optical Society of America B: Optical Physics

Volume

6

Issue

4

Number of Pages

567-578

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/JOSAB.6.000567

Socpus ID

84975575223 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84975575223

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