The Origin of Third‐Order Optical Nonlinearity in Exciton Systems

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1 Citation (Scopus)


The third‐order optical nonlinearity is estimated to be −10−4 e. s. u. at the exciton resonance in PbI2 evaporated films from the population oscillation effect. Such a large nonlinearity cannot be explained if the system is regarded as independent oscillators. The origin of the third‐order nonlinearity is examined in the density matrix formalism. The observed large nonlinearity is shown to come from the exciton‐exciton interaction.

Original languageEnglish
Pages (from-to)371-378
Number of pages8
Journalphysica status solidi (b)
Issue number1
Publication statusPublished - 1990 May 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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