A. A. Ivanov, M. V. Alfimov, A. M. Zheltikov, “Femtosecond dephasing of coherent excitation and ultrafast switching of resonant optical nonlinearity of molecular aggregates”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2006, Volume 83, Issue 10,Pages <nobr>513

ATOMS, SPECTRA, RADIATIONS

Femtosecond dephasing of coherent excitation and ultrafast switching of resonant optical nonlinearity of molecular aggregates

A. A. Ivanov^ab, M. V. Alfimov^b, A. M. Zheltikov^c

^a International Laser Center of Moscow State University
^b Photochemistry Centre, Russian Academy of Sciences
^c M. V. Lomonosov Moscow State University, Faculty of Physics

Abstract: One-and two-photon-resonant nonlinear-optical interactions of ultrashort laser pulses are employed to measure the dephasing time of coherent excitation and to investigate the ultrafast population dynamics of molecular aggregates. Dephasing of coherent excitation of molecular aggregates with a characteristic phase relaxation time of about 120 fs is visualized. Ultrafast switching of optical nonlinearity in molecular aggregates with a typical switching time of about 450 fs is demonstrated.

PACS: 42.65.Wi, 42.81.Qb

Received: 04.04.2006