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Emission of terahertz waves in the interaction of a laser pulse with clusters

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Abstract

A theory of generation of terahertz radiation in the interaction of a femtosecond laser pulse with a spherical cluster is developed for the case in which the density of free electrons in the cluster plasma exceeds the critical value. The spectral, angular, and energy characteristics of the emitted terahertz radiation are investigated, as well as its spatiotemporal structure. It is shown that the directional pattern of radiation has a quadrupole structure and that the emission spectrum has a broad maximum at a frequency nearly equal to the reciprocal of the laser pulse duration. It is found that the total radiated energy depends strongly on the cluster size. Analysis of the spatiotemporal profile of the terahertz signal shows that it has a femtosecond duration and contains only two oscillation cycles.

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Authors and Affiliations

  1. Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya ul. 13-2, Moscow, 125412, Russia

    A. A. Frolov

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  1. A. A. Frolov
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Correspondence to A. A. Frolov.

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Original Russian Text © A.A. Frolov, 2016, published in Fizika Plazmy, 2016, Vol. 42, No. 7, pp. 627–637.

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Frolov, A.A. Emission of terahertz waves in the interaction of a laser pulse with clusters. Plasma Phys. Rep. 42, 637–646 (2016). https://doi.org/10.1134/S1063780X16070035

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  • DOI: https://doi.org/10.1134/S1063780X16070035

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