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Optical Nonlinearity Due to the Excitonic System in CuCl
Author(s) -
Nagasawa N.
Publication year - 1988
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.2221500273
Subject(s) - excitation , raman scattering , exciton , raman spectroscopy , resonance (particle physics) , grating , polarization (electrochemistry) , spectroscopy , photon , absorption (acoustics) , polariton , materials science , nonlinear optics , molecular physics , spectral line , scattering , atomic physics , photon energy , optics , optoelectronics , chemistry , physics , laser , condensed matter physics , quantum mechanics , astronomy
The optical nonlinearity associated with the giant two‐photon absorption, GTA, of excitonic molecules in CuCl is discussed. The metamorphoses of the four‐wave mixing spectra due to the generation of the exciton grating are demonstrated by the observation of their polarization characteristics. The propagation characteristics of the excitation around the GTA resonance are observed by micro‐Raman spectroscopy. The two‐photon Raman scattering light is used as a probe to monitor the spatial character of the excitation. The propagation characteristics show a drastic change in the very narrow spectral range around the GTA resonance energy.