Chaotic absorption of coherent laser light by an anharmonic molecule

Details Chaotic absorption of coherent laser light by an anharmonic molecule Chaotic absorption of coherent laser light by an anharmonic molecule

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002spie.4748...89u&link_type=abstract

Proc. SPIE Vol. 4748, p. 89-96, ICONO 2001: Fundamental Aspects of Laser-Matter Interaction and Physics of Nanostructures, Anato

Physics

Scientific paper

A model for multiple photon excitation of molecular vibrational modes by an infrared laser field is developed. The closed semiclassical Heisenberg equations of motion for a periodically driven anharmonic oscillator with two degrees of freedom are derived. The equations for a free nonlinear oscillator with two degrees of freedom are shown to be integrable with solution in terms of Jacobian elliptic functions resulting in a strictly regular intermode exchange of energy. When illuminating the molecule by a periodic infrared laser field, the absorption may strongly depend on the values of the molecular and laser parameters. We find numerically that the molecule may absorb coherent laser light chaotically. A mechanism of the onset of Hamiltonian chaos in our system is studied, using Poincare sections.

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