Mechanism of Interaction of Picosecond Light Pulses with Matter Yielding Self-Trapping

  • Arkadiusz H. Piekara


Recent achievements in the field of light trapping within spherical molecules using picosecond pulses [1,2] compelled physicists to search for another mechanism of self-trapping than optical Kerr effect. Thus, electronic hyperpolarizability of molecules was discussed.[3] However, this process seems to be not adequate to explain self-trapping, giving no saturation of the Kerr constant. [4,5] Instead, another kind of interaction between the intense electric field of a light wave and lattice vibrations in liquids and solids was proposed in a series of papers.[6] This process consists in a dipole-dipole interaction, both dipoles being induced by the electric field of a light wave. Even in a molecular lattice with molecules of spherical symmetry this interaction, called “pull effect”, provides attractive forces between neighboring molecules. This results in vibration enhancement followed by an increase of molecular polarizability, increasing thereby the electric permittivity for the optical frequency of the medium:
$$\varepsilon = {\varepsilon _0} + {\varepsilon _2}{E^2} + {\varepsilon _4}{E^4} + \ldots ,$$
where the term ɛ2E2 is positive and predominant.


Light Wave Light Trapping Electric Permittivity Picosecond Pulse Molecular Polarizability 
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Copyright information

© Plenum Press, New York 1973

Authors and Affiliations

  • Arkadiusz H. Piekara
    • 1
  1. 1.Warsaw UniversityWarszawaPoland

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