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The Origin of Third‐Order Optical Nonlinearity in Exciton Systems
Author(s) -
Ishihara T.
Publication year - 1990
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221590143
Subject(s) - exciton , nonlinear system , formalism (music) , nonlinear optical , oscillation (cell signaling) , physics , condensed matter physics , biexciton , nonlinear optics , third order , population , quantum mechanics , chemistry , art , musical , biochemistry , philosophy , theology , demography , sociology , visual arts
The third‐order optical nonlinearity is estimated to be −10 −4 e. s. u. at the exciton resonance in PbI 2 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.