Stimulated Brillouin scattering of the beat wave of two lasers in a plasma

Panwar, Anuraj; Sharma, A K

doi:10.1063/1.3212988

Title: Stimulated Brillouin scattering of the beat wave of two lasers in a plasma

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Abstract

Stimulated Brillouin scattering of two collinear lasers in a plasma is investigated. Lasers exert a longitudinal ponderomotive force on electrons, imparting them oscillatory axial velocity at the beat frequency. This velocity acts as a driver for parametric excitation of an ion acoustic wave (omega,k-vector) and a noncollinear sideband electromagnetic wave (omega{sup '},k-vector{sup '}). The driver velocity v-vector{sub 0-} couples to the sideband wave to exert a ponderomotive force at (omega,k-vector) on the electrons, driving the ion acoustic wave. The density perturbation of ion acoustic wave beats with v-vector{sub 0-} to produce a nonlinear current at (omega{sup '},k-vector{sup '}), driving the sideband. In the case of finite spot size Gaussian laser beams, the beat wave has a Gaussian profile and excites an ion acoustic wave (omega,k-vector) and a backscattered TM mode (omega{sup '},k-vector{sub z}{sup '}). The growth rate scales as the product of amplitudes of the lasers and maximizes at optimum values of scattering angles. The parametric instability of difference frequency driver is stronger than the sum frequency driver.

Authors:

Panwar, Anuraj; Sharma, A K ^[1]

Center for Energy Studies, Indian Institute of Technology Delhi, New Delhi 110016 (India)

Publication Date:: Tue Sep 15 00:00:00 EDT 2009

OSTI Identifier:: 21361821

Resource Type:: Journal Article

Journal Name:: Journal of Applied Physics

Additional Journal Information:: Journal Volume: 106; Journal Issue: 6; Other Information: DOI: 10.1063/1.3212988; (c) 2009 American Institute of Physics; Journal ID: ISSN 0021-8979

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMPLITUDES; BRILLOUIN EFFECT; ELECTROMAGNETIC RADIATION; ELECTRONS; EXCITATION; ION ACOUSTIC WAVES; LASERS; NONLINEAR PROBLEMS; PARAMETRIC INSTABILITIES; PERTURBATION THEORY; PLASMA; PLASMA DENSITY; PONDEROMOTIVE FORCE; VECTORS; COHERENT SCATTERING; ELEMENTARY PARTICLES; ENERGY-LEVEL TRANSITIONS; FERMIONS; INSTABILITY; ION WAVES; LEPTONS; PLASMA INSTABILITY; PLASMA MACROINSTABILITIES; PLASMA WAVES; RADIATIONS; SCATTERING; TENSORS

Citation Formats


                    Panwar, Anuraj, and Sharma, A K. Stimulated Brillouin scattering of the beat wave of two lasers in a plasma.  United States: N. p., 2009. 
        Web.  doi:10.1063/1.3212988.

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                    Panwar, Anuraj, & Sharma, A K. Stimulated Brillouin scattering of the beat wave of two lasers in a plasma.  United States.  https://doi.org/10.1063/1.3212988

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                    Panwar, Anuraj, and Sharma, A K. 2009.  
        "Stimulated Brillouin scattering of the beat wave of two lasers in a plasma".  United States.  https://doi.org/10.1063/1.3212988.

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@article{osti_21361821,

  title        = {Stimulated Brillouin scattering of the beat wave of two lasers in a plasma},

  author       = {Panwar, Anuraj and Sharma, A K},

  abstractNote = {Stimulated Brillouin scattering of two collinear lasers in a plasma is investigated. Lasers exert a longitudinal ponderomotive force on electrons, imparting them oscillatory axial velocity at the beat frequency. This velocity acts as a driver for parametric excitation of an ion acoustic wave (omega,k-vector) and a noncollinear sideband electromagnetic wave (omega{sup '},k-vector{sup '}). The driver velocity v-vector{sub 0-} couples to the sideband wave to exert a ponderomotive force at (omega,k-vector) on the electrons, driving the ion acoustic wave. The density perturbation of ion acoustic wave beats with v-vector{sub 0-} to produce a nonlinear current at (omega{sup '},k-vector{sup '}), driving the sideband. In the case of finite spot size Gaussian laser beams, the beat wave has a Gaussian profile and excites an ion acoustic wave (omega,k-vector) and a backscattered TM mode (omega{sup '},k-vector{sub z}{sup '}). The growth rate scales as the product of amplitudes of the lasers and maximizes at optimum values of scattering angles. The parametric instability of difference frequency driver is stronger than the sum frequency driver.},

  doi          = {10.1063/1.3212988},

  url          = {https://www.osti.gov/biblio/21361821},
  journal      = {Journal of Applied Physics},

  issn         = {0021-8979},

  number       = 6,

  volume       = 106,

  place        = {United States},

  year         = {Tue Sep 15 00:00:00 EDT 2009},

  month        = {Tue Sep 15 00:00:00 EDT 2009}

}

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