ON THE THEORY OF LASER ACTION IN DENSE EXCITON SYSTEMS.

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Abstract

The rate equations for the exciton-exciton (ex-ex), exciton-electron (ex-e) and exciton-hole (ex-h) recombination processes are derived by taking into account polariton effects. The solutions of the stationary rate equations yield the spectra of the spontaneous emission and of the gain. Their temperature-dependent shifts are calculated by taking into account self-energy corrections which improve the agreement with experiment. Furthermore, the various threshold pump rates are calculated. Due to these results it is expected that the laser action should start at low temperatures for the ex-ex process, at intermediate temperatures for the ex-LO phonon process (which has been treated previously), and at high temperatures for the ex-e process. The temperature ranges in which the nonlinear recombination processes (ex-ex, ex-e) have the lowest threshold increase with decreasing resonator quality. Numerical results are given for example for CdS.

Original languageEnglish (US)
Pages (from-to)531-543
Number of pages13
JournalPhysica Status Solidi (B) Basic Research
Volume82
Issue number2
Publication statusPublished - Aug 1977
Externally publishedYes

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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