Laser beat wave excitation of terahertz radiation in a plasma slab

Chauhan, Santosh; Parashar, Jetendra

doi:10.1063/1.4900622

Title: Laser beat wave excitation of terahertz radiation in a plasma slab

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Abstract

Terahertz (THz) radiation generation by nonlinear mixing of lasers, obliquely incident on a plasma slab is investigated. Two cases are considered: (i) electron density profile is parabolic but density peak is below the critical density corresponding to the beat frequency, (ii) plasma boundaries are sharp and density is uniform. In both cases, nonlinearity arises through the ponderomotive force that gives rise to electron drift at the beat frequency. In the case of inhomogeneous plasma, non zero curl of the nonlinear current density gives rise to electromagnetic THz generation. In case of uniform plasma, the sharp density variation at the plasma boundaries leads to radiation generation. In a slab width of less than a terahertz wavelength, plasma density one fourth of terahertz critical density, laser intensities ∼10{sup 17 }W/cm{sup 2} at 1 μm, one obtains the THz intensity ∼1 GW/cm{sup 2} at 3 THz radiation frequency.

Authors:

Chauhan, Santosh; Parashar, Jetendra ^[1]

Department of Applied Physics, Samrat Ashok Technological Institute, Vidisha 464001, Madhya Pradesh (India)

Publication Date:: Wed Oct 15 00:00:00 EDT 2014

OSTI Identifier:: 22299710

Resource Type:: Journal Article

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 21; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CURRENT DENSITY; ELECTRON DENSITY; ELECTRON DRIFT; INHOMOGENEOUS PLASMA; LASERS; NONLINEAR PROBLEMS; PLASMA DENSITY; PONDEROMOTIVE FORCE; RISE

Citation Formats


                    Chauhan, Santosh, and Parashar, Jetendra. Laser beat wave excitation of terahertz radiation in a plasma slab.  United States: N. p., 2014. 
        Web.  doi:10.1063/1.4900622.

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                    Chauhan, Santosh, & Parashar, Jetendra. Laser beat wave excitation of terahertz radiation in a plasma slab.  United States.  https://doi.org/10.1063/1.4900622

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                    Chauhan, Santosh, and Parashar, Jetendra. 2014.  
        "Laser beat wave excitation of terahertz radiation in a plasma slab".  United States.  https://doi.org/10.1063/1.4900622.

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@article{osti_22299710,

  title        = {Laser beat wave excitation of terahertz radiation in a plasma slab},

  author       = {Chauhan, Santosh and Parashar, Jetendra},

  abstractNote = {Terahertz (THz) radiation generation by nonlinear mixing of lasers, obliquely incident on a plasma slab is investigated. Two cases are considered: (i) electron density profile is parabolic but density peak is below the critical density corresponding to the beat frequency, (ii) plasma boundaries are sharp and density is uniform. In both cases, nonlinearity arises through the ponderomotive force that gives rise to electron drift at the beat frequency. In the case of inhomogeneous plasma, non zero curl of the nonlinear current density gives rise to electromagnetic THz generation. In case of uniform plasma, the sharp density variation at the plasma boundaries leads to radiation generation. In a slab width of less than a terahertz wavelength, plasma density one fourth of terahertz critical density, laser intensities ∼10{sup 17 }W/cm{sup 2} at 1 μm, one obtains the THz intensity ∼1 GW/cm{sup 2} at 3 THz radiation frequency.},

  doi          = {10.1063/1.4900622},

  url          = {https://www.osti.gov/biblio/22299710},
  journal      = {Physics of Plasmas},

  issn         = {1070-664X},

  number       = 10,

  volume       = 21,

  place        = {United States},

  year         = {Wed Oct 15 00:00:00 EDT 2014},

  month        = {Wed Oct 15 00:00:00 EDT 2014}

}

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