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Laser beat-wave interaction with electron–hole plasmas relevant to terahertz field generation

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Abstract

Laser-plasma-based electromagnetic radiation generation is significant as the properties of electromagnetic radiation can be tuned with laser and plasma parameters for specific applications. We investigate the effect of laser pulse top flatness on terahertz field generation using nonlinear mixing of two co-propagating lasers through n-type semiconductor (InSb). Laser beat envelope pushes free electrons with a nonlinear velocity that couples with charge carrier density and generates nonlinear current. Time varying current acts as a source of electromagnetic field in the range of THz. Our numerical calculations report a reasonable enhancement in the peak value of the THz field due to the flatness of the laser intensity amplitude. Also, the conversion efficiency is improved up to tenfold for flat-Gaussian laser pulses with hole-density modulation of 30% in electron–hole plasmas.

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Authors and Affiliations

  1. Department of Physics and Electronics, Rajdhani College (University of Delhi), Delhi, 110015, India

    A. P. Singh & K. Gopal

  2. Department of Physics and Astrophysics, University of Delhi, Delhi, 110007, India

    D. N. Gupta

  3. Institute for Plasma Research, Bhat, Gandhinagar, Gujarat, 382428, India

    M. Kundu & P. Varshney

Authors
  1. A. P. Singh
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  2. K. Gopal
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  3. D. N. Gupta
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  4. M. Kundu
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  5. P. Varshney
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Correspondence to P. Varshney.

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Singh, A.P., Gopal, K., Gupta, D.N. et al. Laser beat-wave interaction with electron–hole plasmas relevant to terahertz field generation. Indian J Phys 98, 383–389 (2024). https://doi.org/10.1007/s12648-023-02832-7

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  • DOI: https://doi.org/10.1007/s12648-023-02832-7

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