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Room temperature excitonic nonlinear absorption and refraction in GaAs/AlGaAs multiple quantum well structures

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5 Author(s)

We present detailed experimental studies and modeling of the nonlinear absorption and refraction of GaAs/AlGaAs multiple quantum well structures (MQWS) in the small signal regime. Nonlinear absorption and degenerate four-wave mixing in the vicinity of the room temperature exciton resonances are observed and analyzed. Spectra of the real and imaginary parts of the nonlinear cross section as a function of wavelength are obtained, and these are in excellent agreement with experimental data. A simple model for excitonic absorption saturation is proposed; it accounts qualitatively for the very low saturation intensities of room temperature excitons in MQWS.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:20 ,  Issue: 3 )

Date of Publication:

Mar 1984

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