Group of Femtosecond Processes & intense Laser (PFL)
Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS-Université Bourgogne Franche-Comté, DIJON, FRANCE
In 2015 we have reported on one of the simplest classical systems featuring the echo phenomenon—a collection of randomly oriented free rotors with dispersed rotational velocities. Following excitation by a pair of time-delayed impulsive kicks, the mean alignment of the ensemble exhibits multiple echoes and fractional echoes. We have elucidated the mechanism of the echo formation by the kick-induced filamentation of phase space, and provided the first experimental demonstration of classical alignment echoes in a thermal gas of CO2 molecules excited by a pair of femtosecond laser pulses .
This study has been achieved in collaboration with the Université Paris Est Créteil and the Weizmann Institute of Science in Israel.
 G. Karras, E. Hertz, F. Billard, B. Lavorel, J.M. Hartmann, O. Faucher, E. Gershnabel, Y. Prior, I.S. Averbukh, Orientation and Alignment Echoes, Phys. Rev. Lett., 114 153601 (2015).
Olivier Faucher (53 years-old, male) is full Professor at the Physics Department of the Université Bourgogne Franche-Comté. He is the head of one of the leading groups with a research activity on laser-induced field-free molecular alignment. He has a strong expertise in research topics related to experimental studies of atoms and molecules exposed to ultra short and intense laser pulses.
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