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

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

Friday 5^th 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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