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On the Peculiarities of THz Radiation Generation in a Laser Induced Plasmas

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Abstract

Experimental data on terahertz generation from laser spark created by linearly polarized femtosecond pulses focused by spherical lenses are presented. Specific features of generated terahertz radiation registered in the latest experiments for the case of monochromatic laser pulse definitely demonstrate severe deviation from the axial symmetry, which results from conventionally used model for low-frequency current excitation in a laser spark due to the ponderomotive action from fs laser pulse. The new approach to the theoretical interpretation basing on kinetic description for electron distribution function has been developed with taking into account peculiarities of the tunnel ionization under the action of linearly polarized laser field. A simple generalization of developed model for the case of applying external dc electric field to the region of gas breakdown allowed to describe the modification of terahertz radiation pattern depending on the value of external dc field.

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Acknowlegment

This work has been supported by Russian Foundation for Basic Researches (Grants ## 08-02-00978, 08-02-01260 and 09-02-12324) and Marie Curie Actions (grant PIRSESGA-2008-230777).

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Authors and Affiliations

  1. Institute of Applied Physics of Russian Academy of Sciences, 46 Ul’yanov Street, 603950, Nizhny Novgorod, Russia

    Evgeny Suvorov, Rinat Akhmedzhanov, Daniil Fadeev, Igor Ilyakov, Vyacheslav Mironov & Boris Shishkin

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  1. Evgeny Suvorov
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  2. Rinat Akhmedzhanov
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  3. Daniil Fadeev
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  4. Igor Ilyakov
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  5. Vyacheslav Mironov
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  6. Boris Shishkin
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Correspondence to Daniil Fadeev.

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Suvorov, E., Akhmedzhanov, R., Fadeev, D. et al. On the Peculiarities of THz Radiation Generation in a Laser Induced Plasmas. J Infrared Milli Terahz Waves 32, 1243–1252 (2011). https://doi.org/10.1007/s10762-011-9817-2

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  • DOI: https://doi.org/10.1007/s10762-011-9817-2

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