Density Transition Based Self-Focusing of cosh-Gaussian Laser Beam in Plasma with Linear Absorption*

Kant, Niti; Wani, Mohd Lateef

doi:10.1088/0253-6102/64/1/103

Cited by 39 publications

(4 citation statements)

References 37 publications

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“…Ponderomotive [45], thermal [46], and relativistic [47] mechanisms can individually lead to the SF of an intense laser beam in plasma. Nonlinear propagation of a laser beam in unbounded plasma, taking into account the SF phenomenon during its propagation, has been theoretically investigated in many articles (see [32,[45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] to give just a few examples).…”

Section: Introductionmentioning

confidence: 99%

Self-focusing of linearly-polarized laser beam in the semi-bounded magnetized warm plasma: competition of right- and left-hand circularly-polarized modes

Javan

Mogaddam

2020

Plasma Phys. Control. Fusion

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In this theoretical work, we study the non-linear propagation of a linearly-polarized laser beam, which is normally incident on the surface of semi-bounded magnetized warm plasma. Inside the plasma, the linearly-polarized laser beam is considered as a combination of system modes, i.e. right- and left-hand circularly-polarized modes that each behave differently. Based on a perturbative method, coupled non-linear wave equations are derived for these modes, and the problem of self-focusing is investigated. It is demonstrated that laser frequency has an essential impact on the non-linear dynamics of modes. At the frequency area where both modes can propagate, the right- and left-hand modes’ behavior is different in comparison with the uncoupled propagation of individual modes. In this case, an increase in the external magnetic field improves the focusing property of both modes.

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Section: Introductionmentioning

confidence: 99%

Self-focusing of linearly-polarized laser beam in the semi-bounded magnetized warm plasma: competition of right- and left-hand circularly-polarized modes

Javan

Mogaddam

2020

Plasma Phys. Control. Fusion

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“…Influence of density transition on self-focusing of laser in plasma was studied [15] and it was concluded that an earlier and efficient self-focusing of the laser can be observed with density transition whereas due to linear absorption weaker self-focusing occurs in plasma. A remarkable influence of the intensity and decentered parameters on selffocusing of Hermite-cosine-Gaussian laser beam with collisionless plasma was observed.…”

Section: Introductionmentioning

confidence: 99%

Relativistic Self-Focusing of Hermite-cosine-Gaussian Laser Beam in Collisionless Plasma with Exponential Density Transition

Thakur

Wani²,

Kant

2019

Commun. Theor. Phys.

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This work reveals an exploration of self-focusing of Hermite-cosine-Gaussian laser beam in a collisionless plasma under relativistic nonlinearity. Self-focusing along with self-trapping of Hermite-cosine-Gaussian laser beam are analyzed for different values of laser intensity, plasma density, and decentered parameters. Mathematical analysis displays that these parameters play a major role in achieving the stronger and earlier self-focusing. Further, a comparative study between self-focusing of Hermite-cosine-Gaussian laser beam with and without exponential density ramp profile is introduced. Plasma density transition with exponential profile is found to be more effective in order to have stronger self-focusing. The present analysis may lead to very useful applications in the field of efficient harmonic generation, laser driven fusion etc.

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“…[16] Also, it has been observed that, under the influence of magnetic field and plasma density ramp, the selffocusing becomes stronger up to great extent. [17] Kant and Wani, [18] examined the behavior of the beam width parameter for normalized distance of propagation at optimized values of decentered parameters, plasma density and various absorption levels. Further, in quantum plasma self-focusing of cosh-Gaussian laser beam was presented by Habibi and Ghamari [19] by following higher order paraxial theory.…”

Section: Introductionmentioning

confidence: 99%

Relativistic Self-Focusing of Hermite-cosh-Gaussian Laser Beam in Magnetoplasma with Exponential Plasma Density Ramp

Kant

Vij

Chakravarti

et al. 2019

Commun. Theor. Phys.

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In the present manuscript, we analyse the effect of exponential plasma density ramp for relativistic self-focusing of Hermite-cosh-Gaussian laser pulse in magnetoplasma. The exponential plasma density ramp is found to be more prominent in achieving the stronger self-focusing of Hermite-cosh-Gaussian laser beam in comparison to the tangential plasma density ramp. We propose a theoretical model for propagation of Hermite-cosh-Gaussian laser pulse in magnetoplasma with exponential density ramp. The nonlinearity in the medium arises because of the relativistic motion of electrons, being responsible for relativistic self-focusing. Equation of the beam width parameter is set up by taking the expression for the dielectric function and following Wentzel-Kramers-Brillouin (WKB) with paraxial ray approximations for mode indices m = 0, 1 and 2. Effect of decentered parameter is also analysed, which results in stronger self-focusing of the Hermite-cosh-Gaussian laser beam. Stronger self-focusing of laser beam is more pronounced in high density plasma with higher magnetic field.

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Density Transition Based Self-Focusing of cosh-Gaussian Laser Beam in Plasma with Linear Absorption*

Cited by 39 publications

References 37 publications

Self-focusing of linearly-polarized laser beam in the semi-bounded magnetized warm plasma: competition of right- and left-hand circularly-polarized modes

Self-focusing of linearly-polarized laser beam in the semi-bounded magnetized warm plasma: competition of right- and left-hand circularly-polarized modes

Relativistic Self-Focusing of Hermite-cosine-Gaussian Laser Beam in Collisionless Plasma with Exponential Density Transition

Relativistic Self-Focusing of Hermite-cosh-Gaussian Laser Beam in Magnetoplasma with Exponential Plasma Density Ramp

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