Theoretical study of ultrafast dephasing by four-wave mixing

Claudine Hoerner; J. P. Lavoine; A. A. Villaeys

doi:10.1117/12.24479

1 February 1991 Theoretical study of ultrafast dephasing by four-wave mixing

Claudine Hoerner, J. P. Lavoine, A. A. Villaeys

Proceedings Volume 1362, Physical Concepts of Materials for Novel Optoelectronic Device Applications II: Device Physics and Applications; (1991) https://doi.org/10.1117/12.24479
Event: Physical Concepts of Materials for Novel Optoelectronic Device Applications, 1990, Aachen, Germany

Abstract

Microscopic dynamics. of materials can be studied by time delayed four-wave mixing spectroscopy. Dephasing constants can be measured by such experiments. Experimental results are easily analysed when the correlation time r of the exciting electric field is much shorter than the dephasing time ''2 However when these quantities are on the same time scale numerical fits are necessary. In the present work we analysed theoretically a time delayed four-wave mixing experiment. The material is described by an ensemble of two-level systems and a large inhomogeneous broadening is assumed. Using the third order term of the density matrix we establish a relation between 1''2 -r and ''Tm the time delay for which the maximum of the diffracted light intensity is observed. The conditions to obtain an estimate of T2 from the measurement of Tm are discussed.

Citation Download Citation

Claudine Hoerner, J. P. Lavoine, and A. A. Villaeys "Theoretical study of ultrafast dephasing by four-wave mixing", Proc. SPIE 1362, Physical Concepts of Materials for Novel Optoelectronic Device Applications II: Device Physics and Applications, (1 February 1991); https://doi.org/10.1117/12.24479

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