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Optical Nonlinearity and Phase Coherence in CdSe and CdSe x S 1− x
Author(s) -
Hvam J. M.,
Dörnfeld C.,
Schwab H.
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.2221500206
Subject(s) - dephasing , exciton , biexciton , degenerate energy levels , coherence (philosophical gambling strategy) , picosecond , condensed matter physics , phase (matter) , semiconductor , materials science , four wave mixing , nonlinear optics , nonlinear optical , cadmium selenide , molecular physics , nonlinear system , physics , optics , quantum dot , optoelectronics , quantum mechanics , laser
The magnitude of the optical nonlinearity and its phase coherence are investigated at low temperatures in single crystals of CdSe and CdSe x S 1− x , using picosecond time resolved degenerate four‐wave mixing. In the pure compound semiconductors, the optical nonlinearity as well as the dephasing is governed by free exciton and biexciton interactions. In the mixed crystals, excitons localized by the alloy disorder play the dominant role, giving rise to larger nonlinearities and longer dephasing times than in the pure compounds.