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Elliptic dichroism, ellipticity and the offset angle of high harmonics generated by arbitrary homonuclear diatomic molecules

  • Interaction of Laser Radiation with Matter
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Laser Physics

Abstract

The nth harmonic emission rate has contributions of the components of the T-matrix element in the direction of the laser-field polarization and in the direction perpendicular to it. Using both components of the T-matrix element we present a theoretical approach for calculation of the ellipticity and the offset angle of high harmonics. The molecular bound state is represented by HOMO or by HOMO-1. We show that high harmonics, generated by molecules oriented by an angle θL with respect to the major semiaxis of the laserfield polarization ellipse, are elliptically polarized even if the applied field is linearly polarized. Using examples of N2 and O2 molecules we show the existence of extrema and sudden changes of the harmonic ellipticity and the offset angle for particular molecular alignment. The interference between different contributions to the T-matrix element depends on the molecular symmetry. Presenting partial or total parameters of elliptic dichroism in the (θL, n) plane clear interference minima are observed. Therefore, the measurement of the elliptic dichroism may reveal information about the molecular structure and symmetry.

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Authors and Affiliations

  1. Faculty of Science, University of Sarajevo, Zmaja od Bosne 35, 71000, Sarajevo, Bosnia and Herzegovina

    S. Odžak & D. B. Milošević

  2. Max-Born-Institut, Max-Born-Str. 2a, 12489, Berlin, Germany

    D. B. Milošević

  3. Academy of Sciences and Arts of Bosnia and Herzegovina, Sarajevo, Bosnia and Herzegovina

    D. B. Milošević

Authors
  1. S. Odžak
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  2. D. B. Milošević
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Correspondence to S. Odžak.

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Original Text © Astro, Ltd., 2012.

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Odžak, S., Milošević, D.B. Elliptic dichroism, ellipticity and the offset angle of high harmonics generated by arbitrary homonuclear diatomic molecules. Laser Phys. 22, 1780–1786 (2012). https://doi.org/10.1134/S1054660X12120225

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