Femtosecond recovery of exciton bleaching in the optical Stark effect

J. P. Sokoloff, S. G. Lee, R. Jin, P. A. Harten, R. Binder, Stephan W. Koch, H. M. Gibbs, Nasser Peygham-Barian

Research output: Contribution to conferencePaperpeer-review


The observation of a very fast recovery of the exciton bleaching for an off-resonance excitation condition in a quantum-well sample at room temperature is reported. The experiments were performed on a GaAs/AlGaAs multiple quantum well (MQW) with 76-angstrom well sizes. A hybridly mode-locked dye laser that yielded 70-fs (FWHM) pulses at an 82-MHz repetition rate centered at ≅865 nm was used. The time delay was varied by changing the optical path of the pump pulse. The absorption spectra of the probe and the numerically evaluated excitonic absorption spectra, both at various time delays, are shown and discussed. The good agreement between the experimental results and the numerical calculations of the time-resolved absorption spectra suggests a coherent transient population buildup and decay occurring on the time scale of the pump pulse.

Original languageEnglish (US)
Number of pages2
StatePublished - 1990
Event17th International Conference on Quantum Electronics - IQEC '90 - Anaheim, CA, USA
Duration: May 21 1990May 25 1990


Other17th International Conference on Quantum Electronics - IQEC '90
CityAnaheim, CA, USA

ASJC Scopus subject areas

  • Engineering(all)


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