SPECTRAL DEPENDENCE AND DIFFUSION EFFECTS IN THE NONLINEAR OPTICAL ABSORPTION OF GAAS/ALGAAS MULTIPLE QUANTUM WELLS.

A. Kost, M. Kawase, E. M. Garmire, H. C. Lee, A. Hariz, P. D. Dapkus

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

GaAs/AlGaAs multiple quantum wells (MQW) grown by metalorganic chemical vapor deposition have been studied. The growth conditions were tailored to optimize the nonlinear optical properties. Previous studies of the wavelength dependence of nonlinear excitonic absorption have been limited to relatively small intensities. Measurements are reported of the spectral dependence of the absorption coefficient of GaAs/AlGaAs MQWs near the n equals 1 excitonic resonances for intensities that vary by more than three orders of magnitude. Measurements were made in CW conditions, using pulses 2-ps long. The preliminary results show that picosecond pulses are 2-3 times more effective than CW excitation in saturating absorption when comparable average intensities are used. This is attributed to diffusion of photoexcited carriers out of the 15- mu m spot. Quantitative comparison of pulsed and cw spectra vs. input spot size is presented.

Original languageEnglish (US)
Title of host publicationUnknown Host Publication Title
PublisherOptical Soc of America
Pages30-32
Number of pages3
ISBN (Print)0936659513
StatePublished - 1987
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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