Second harmonic generation of self-focused Hermite-Gaussian laser beam in collisional plasma

Wadhwa, Jyoti; Singh, Arvinder

doi:10.1016/j.ijleo.2019.01.116

Cited by 19 publications

(3 citation statements)

References 24 publications

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“…Recently, many researchers have analyzed the effects of different types of laser beams and plasma on self-focusing/self-defocusing. Laser beam extends from Gaussian type to the others type of beam, such as Hermite-Gaussian beam [20], cosh-Gaussian beam [21], super Gaussian beam [22]. Various types plasmas have been researched, such as cold quantum plasma with exponential density variation [23].…”

Section: Introductionmentioning

confidence: 99%

Self-focusing/Defocusing of Hermite-Sinh-Gaussian Laser Beam in Underdense Inhomogeneous Plasmas

Tian

Xia

2022

Laser Part. Beams

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The self-focusing/defocusing of Hermite-sinh-Gaussian (HshG) laser beam in underdense inhomogeneous plasmas is studied by using higher-order approximation theory. It is found that Hermite mode index and the fluctuation of the periodic plasma density have a significant effect on the dielectric constant and laser beam self-focusing/self-defocusing. With the increase of mode index, the high-order HshG laser beam is beneficial to suppress self-focusing and enhance self-defocusing. In addition, the effects of decentered parameters, beam intensity, and plasma non-uniformity on self-focusing/self-defocusing are discussed.

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Section: Introductionmentioning

confidence: 99%

Self-focusing/Defocusing of Hermite-Sinh-Gaussian Laser Beam in Underdense Inhomogeneous Plasmas

Tian

Xia

2022

Laser Part. Beams

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“…The effective dielectric function gets modified significantly, due to selfinduced nonlinearity dependence on the intensity of the laser beam [8]. The propagation of different kinds of laser beam profiles like Gaussian beams [9,10], Cosh-Gaussian beams [11][12][13], Hermite -Gaussian beams [14], Hermite-cosh-Gaussian (HChG) beams [15][16][17] etc., in the collisional plasmas has attracted the attention of the many researchers. One should note that in all above beams Gaussian remains intact.…”

Section: Introductionmentioning

confidence: 99%

On the Exploration of q Parameter in Propagation Dynamics of q-Gaussian Laser Beam in Underdense Collisional Plasma

2022

Bulg.J.Phys.

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In the present paper, the nonlinear features of a high-intensity q-Gaussian laser beam propagating in collisional plasma have been investigated. The collisional plasma dynamics is basically dominated by local collisional forces rather than collective actions in it. Naturally, the nonlinearity in the dielectric function of plasma due to nonuniform heating of carriers along the wavefront of the laser beam becomes important. Here in q-Gaussian beam intensity profile q can explored right from extremely low to extremely high value such as infinity. As a consequence of it studies in propagation dynamics becomes quite interesting. By following Akhmanov parabolic equation approach under Wentzel-Kramers-Brillouin (WKB) and paraxial approximations, the differential equation is set up for the beam width parameter f and is solved numerically. The significant effect of wide range of q on critical beam radius as well as on propagation a dynamic of q-gaussian laser beam have been found interesting and is presented graphically.

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“…Plasma is an active medium to exhibit exciting phenomena by the interactions of high power laser beams with it. Different modes of laser beam play a crucial role for exciting the plasmas waves in different points of application [8][9][10][11]. The field optimization of the laser beam can be used as an optimising and tuning parameter for the generation of plasma waves.…”

Section: Introductionmentioning

confidence: 99%

Excitation of electron Bernstein waves by beating of two cosh-Gaussian laser beams in a collisional plasma

Kumar

Varma

2021

Laser Phys.

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In this paper, a theoretical study has been proposed for excitation of electron Bernstein waves in collisional plasma with dc magnetic field by nonlinear interactions of two cosh-Gaussian laser beams. The beat wave with frequency ω = (ω 1 − ω 2 ) and wave vector ⃗ k = ⃗ k 1 + ⃗ k 2 , exerts a nonlinear ponderomotive force on electrons. This nonlinear force has the potential to drive the electron Bernstein wave in collisional plasma with dc magnetic field. The convective loss of waves in plasma is also discussed. An analytical formalism is developed for power going into the electron Bernstein wave with respect to total laser power. The variation of normalized potential and power distribution profile as a function of beam direction, normalized beat wave frequency, and normalized collisional frequency is demonstrated to excite Electron Bernstein waves (EBWs) under resonance conditions. The spatial shape of laser beam, optimum laser beam width parameter, decentred parameter, extreme value of electron thermal velocity and cyclotron frequency is proposed for much more excitation. This proposed theory of electron Bernstein wave excitation may be applicable for plasma heating.

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Second harmonic generation of self-focused Hermite-Gaussian laser beam in collisional plasma

Cited by 19 publications

References 24 publications

Self-focusing/Defocusing of Hermite-Sinh-Gaussian Laser Beam in Underdense Inhomogeneous Plasmas

Self-focusing/Defocusing of Hermite-Sinh-Gaussian Laser Beam in Underdense Inhomogeneous Plasmas

On the Exploration of q Parameter in Propagation Dynamics of q-Gaussian Laser Beam in Underdense Collisional Plasma

Excitation of electron Bernstein waves by beating of two cosh-Gaussian laser beams in a collisional plasma

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