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Computer simulation in femtosecond 3-pulse 2-colour spectroscopy of molecules and semiconductors

Dr S.A. Pulkin

Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology and St. Petersburg State University, Russia

Friday 5th August 2005, 3.30PM, Seminar Room AR103, Graduate Research Centre.

The time-dependent and spectrally resolved nonlinear polarization induced in molecules or semiconductors under strong 3-pulse 2-colour laser field have been investigated numerically. The programs for solution of density matrix equations for 3- and 4-level systems with inhomogeneous broadening were developed. The role of such coherent effects as coherence transfer in transient four- wave mixing processes, grating formation because of quantum beats and formation of photon echo signals is discussed. Preliminary comparisons with experimental results for Rhodamine molecules and GaN semiconductor were made.

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