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Breakdown of dipole approximation and its effect on high harmonic generation

  • R. Mishra
  • D.J. Kalita
  • A.K. GuptaEmail author
Regular Article

Abstract

Here, we present a study of high-harmonic-generation using the model system of polyacetylene when irradiated with intense laser-field. The system is prepared in a time-periodic Floquet-state. Only odd-order harmonics are obtained within dipole approximation due to the dynamical-symmetry of the Floquet-state. However, odd as well as even-order harmonics are obtained in case of beyond-dipole approximation. Dipole approximation is expected to be valid when the electron during oscillation is confined to a very small region compared to the wavelength of light. However, it is found that the dipole approximation breaks down even if the electron remains delocalised over a region less than 1 nm.

Keywords

Ultraintense and Ultra-short Laser Fields 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.Department of ChemistryIndian Institute of TechnologyAssamIndia

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