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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1996),
  • paper QWB5

Continuum contribution to excitonic four-wave mixing

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Abstract

We present an experimental and theoretical investigation of ultrafast transient four-wave mixing (TFWM) of GaAs/AlGaAs quantum wells for simultaneous excitation of exciton and continuum states. Recent TFWM experiments on semiconductors have shown unexpected results when both discrete exciton states and continuum states have been excited simultaneously by ultrafast laser pulses.1,2 The decay of the signal, as a function of delay τ, is significantly faster than the dephasing time of the excitons. However, the width of the spectrally resolved excitonic TFWM response and the real-time evolution of the TFWM signal is reflecting the instrinsic excitonic dephasing time.

© 1996 Optical Society of America

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