Microscopic measurement of photon echo formation in groups of individual excitonic transitions

Wolfgang Langbein, Brian Patton

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The third-order polarization emitted from groups of individual localized excitonic transitions after pulsed optical excitation is measured. We observe the evolution of the nonlinear response from the case of a free polarization decay for a single transition, to that of a photon echo for many transitions. The echo is shown to arise from the mutual rephasing of the emission from individual transitions.
Original languageEnglish
Article number017403
Number of pages4
JournalPhysical Review Letters
Issue number1
Publication statusPublished - 30 Jun 2005


  • third-order polarization
  • excitonic transitions
  • pulsed optical excitation
  • free polarization decay
  • photon echo

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