Accession Number:

ADA179855

Title:

Nonlinear Optical Properties and Subpicosecond Dynamics of Excitons and Electron-Hole Plasmas in Multiple Quantum Well Structures.

Descriptive Note:

Progress rept. Aug-Dec 86,

Corporate Author:

HUGHES RESEARCH LABS MALIBU CA

Personal Author(s):

Report Date:

1987-01-26

Pagination or Media Count:

13.0

Abstract:

Time resolved photoluminescence measurements are reported for Molecular Beam Epitaxially-grown AlxGa1-x As samples having alloy compositions which result in both direct gap and indirect gap materials. Quantitative results have been obtained for bandgap renormalization inducted at high carrier densities and the results compared with a theoretical model. Ultrafast spectroscopy measurements on an MBE grown x0.52 sample following optical excitation well above the bandgap show presistent bleaching of the direct absorption, inducted absorption below the fundamental absorption edge and a blue shift by Fabry Perot fringes in the transparent spectral region. Keywords Aluminum gallium arsenide Photoluminescence Transient absorption Nonlinear optics Quantum wells Superlattices III-V ternary alloys Bandgap renormalization.

Subject Categories:

  • Solid State Physics
  • Electricity and Magnetism
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE