Band-gap renormalization and optical gain formation in highly excited CdSe

Y. Masumoto, B. Fluegel, K. Meissner, S. W. Koch, R. Binder, A. Paul, N. Peyghambarian

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Abstract

This paper reports the direct femtosecond observation of the dynamical bandgap renormalization and optical gain formation in a highly excited CdSe crystal. Interband excitation with 60 fs pulses results in broadening of the exciton at 0 fs, exciton bleaching and bandgap renormalization at 80 fs, and development of optical gain below the exciton level after 80 fs with rise time of 100 fs. At 380 fs, the optical gain reaches its maximum value and subsequently decreases slowly. Stimulated plasma luminescence has a peak around the energy where maximum gain is observed. The data are discussed in terms of plasma cooling, screening, state filling, and band-gap renormalization.

Original languageEnglish (US)
Pages (from-to)732-737
Number of pages6
JournalJournal of Crystal Growth
Volume117
Issue number1-4
DOIs
StatePublished - Feb 2 1992

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ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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