Frequency-domain nonlinear optical studies of relaxation mechanisms and the homogeneous line shape of excitons in GaAs/AlGaAs quantum well structures

Hailin Wang; Jeffrey T. Remillard; Duncan G. Steel; J. Oh; Jagadeesh Pamulapati; Pallab Bhattacharya

doi:10.1117/12.18124

1 May 1990 Frequency-domain nonlinear optical studies of relaxation mechanisms and the homogeneous line shape of excitons in GaAs/AlGaAs quantum well structures

Hailin Wang, Jeffrey T. Remillard, Duncan G. Steel, J. Oh, Jagadeesh Pamulapati, Pallab Bhattacharya

Author Affiliations +

Proceedings Volume 1216, Nonlinear Optical Materials and Devices for Photonic Switching; (1990) https://doi.org/10.1117/12.18124
Event: OE/LASE '90, 1990, Los Angeles, CA, United States

Abstract

Abstract We report high resolution nonlinear laser spectroscopy studies of excitation relaxation associated with the excitonic optical nonlinearity at room temperature and low temperature in GaAs/AlGaAs multiple quantum wells. Using a new method of cw frequency domain four wave mixing, we show that relaxation of the room temperature nonlinear optical response is characterized by free carrier recombination and ambipolar diffusion. At low temperature, the excitation relaxation for localized excitons is dominated by phonon assisted tunneling. In addition, we use four wave mixing methods to eliminate contributions to the excitation line shape from inhomogeneous broadening. The observed line shape is highly asymmetric and shows the presence of spectral diffusion due to the phonon assisted tunneling associated with the excitation relaxation.

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Hailin Wang, Jeffrey T. Remillard, Duncan G. Steel, J. Oh, Jagadeesh Pamulapati, and Pallab Bhattacharya "Frequency-domain nonlinear optical studies of relaxation mechanisms and the homogeneous line shape of excitons in GaAs/AlGaAs quantum well structures", Proc. SPIE 1216, Nonlinear Optical Materials and Devices for Photonic Switching, (1 May 1990); https://doi.org/10.1117/12.18124

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