A scheme for beat wave excitation of electron plasma wave (EPW) is proposed by relativistic cross-focusing of two coaxial Cosh-Gaussian (ChG) laser beams in an under dense plasma. The plasma wave is generated on account of beating of two coaxial laser beams of frequencies and . The mechanism for laser produced nonlinearity is assumed to be relativistic nonlinearity in electron mass. Following moment theory approach in Wentzel Kramers Brillouin (W.K.B) approximation, the coupled differential equations governing the evolution of spot size of laser beams with distance of propagation have been derived. The relativistic nonlinearity depends not only on the intensity of first laser beam but also on the intensity of second laser beam. Therefore, propagation dynamics of one laser beam affect that of second beam and hence cross-focusing of the two laser beams takes place. Due to non uniform intensity distribution of pump laser beams, the background electron concentration gets modified. The amplitude of EPW, which depends on the background electron concentration, thus gets nonlinearly coupled with the laser beams. The effects of relativistic electron mass nonlinearity and the cross-focusing of pump beams on excitation of EPW have been incorporated. Numerical simulations have been carried out to investigate the effect of laser as well as plasma parameters on cross-focusing of laser beams and further its effect on power of excited EPW.
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June 2015
Research Article|
June 25 2015
Beat wave excitation of electron plasma wave by relativistic cross focusing of cosh-Gaussian laser beams in plasma Available to Purchase
Arvinder Singh;
Arvinder Singh
a)
Department of Physics,
National Institute of Technology Jalandhar 144011
, India
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Naveen Gupta
Naveen Gupta
a)
Department of Physics,
National Institute of Technology Jalandhar 144011
, India
Search for other works by this author on:
Arvinder Singh
a)
Department of Physics,
National Institute of Technology Jalandhar 144011
, India
Naveen Gupta
a)
Department of Physics,
National Institute of Technology Jalandhar 144011
, India
a)
Electronic addresses: [email protected] and [email protected]
Phys. Plasmas 22, 062115 (2015)
Article history
Received:
March 04 2015
Accepted:
June 04 2015
Citation
Arvinder Singh, Naveen Gupta; Beat wave excitation of electron plasma wave by relativistic cross focusing of cosh-Gaussian laser beams in plasma. Phys. Plasmas 1 June 2015; 22 (6): 062115. https://doi.org/10.1063/1.4922903
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