Combined effect of ponderomotive and relativistic self-focusing on laser beam propagation in a plasma

Patil, Saiprasad; Takale, M. V.; Fulari, V. J.; Gupta, Devki Nandan; Suk, Hyyong

doi:10.1007/s00340-012-5297-x

Cited by 76 publications

(13 citation statements)

References 31 publications

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“…In selffocusing, intensity profile of laser beam changes the dielectric constant of plasma, it is generally depends on density of the plasma electrons. With increase in plasma density, ponderomotive effects are important while increase in electron mass leads to relativistic effects in plasmas [3]. Consequently, there are three main mechanisms of self-focusing: relativistic, ponderomotive and thermal.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Propagation of Gaussian Laser Beam in Magnetized Plasma: Effect of Oblique Magnetic Field

Pawar¹,

Nikam²,

Takale

et al. 2022

J. Phys.: Conf. Ser.

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In this paper, the propagation of Gaussian laser beam in underdense and magnetized plasma has been studied. The effect of oblique external magnetic field on self-focusing of laser is specifically explored. An envelope equation governing dependence of beam-width parameter with dimensionless distance of propagation of laser is derived by adopting parabolic equation approach under WKB and paraxial approximations. It is found that increasing the angle between the laser beam magnetic field and external magnetic field decreases the self-focusing of laser propagating through plasma.

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Section: Introductionmentioning

confidence: 99%

Nonlinear Propagation of Gaussian Laser Beam in Magnetized Plasma: Effect of Oblique Magnetic Field

Pawar¹,

Nikam²,

Takale

et al. 2022

J. Phys.: Conf. Ser.

Self Cite

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“…Self‐focusing is the most important nonlinear process in laser‐plasma interactions, which is induced by the change in the refractive index of plasma exposed to intense laser radiation. This process affects the uniformity of energy deposition inside the plasma and leads to seeding and growth of hydrodynamic instabilities.…”

Section: Introductionmentioning

confidence: 99%

“…These nonlinearities occur on different time scales and contribute to focusing on a femtosecond time scale at a high intensity. The combined effects of relativistic and ponderomotive nonlinearities on the propagation of a Gaussian laser beam in unmagnetized plasma were investigated in various studies in the past , . In these studies, the contributions of ions are neglected because the ions are massive.…”

Section: Introductionmentioning

confidence: 99%

Self‐focusing of a cosh‐Gaussian laser beam in magnetized plasma under relativistic‐ponderomotive regime

Rawat¹,

Purohit²

2018

Contributions to Plasma Physics

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The combined effect of relativistic and ponderomotive nonlinearities on the self-focusing of an intense cosh-Gaussian laser beam (CGLB) in magnetized plasma have been investigated. Higher-order paraxial-ray approximation has been used to set up the self-focusing equations, where higher-order terms in the expansion of the dielectric function and the eikonal are taken into account. The effects of various lasers and plasma parameters viz. laser intensity (a 0 ), decentred parameter (b), and magnetic field ( c ) on the self-focusing of CGLB have been explored. The results are compared with the Gaussian profile of laser beams and relativistic nonlinearity. Self-focusing can be enhanced by optimizing and selecting the appropriate laser-plasma parameters. It is observed that the focusing of CGLB is fast in a nonparaxial region in comparison with that of a Gaussian laser beam and in a paraxial region in magnetized plasma. In addition, strong self-focusing of CGLB is observed at higher values of a 0 , b, and c . Numerical results show that CGLB can produce ultrahigh laser irradiance over distances much greater than the Rayleigh length, which can be used for various applications. KEYWORDScosh-Gaussian laser beam, laser plasma interaction, magnetized plasma, relativistic-ponderomotive nonlinearity, self-focusing INTRODUCTIONDue to the rapid development of extremely high intensity (>10 18 W/cm 2 ) and ultrashort duration (femtosecond) laser technology, [1,2] the interaction between intense laser beams and plasma becomes highly nonlinear and relativistic. The relativistic interaction of laser beams with plasma has extensive applications such as fast ignition in inertial confinement fusion (ICF), electron acceleration, and new radiation sources. [3][4][5] These applications require transport of relativistic laser pulses with minimal loss in intensity over a considerable distance (several Rayleigh lengths) in the plasma. When such an intense laser beam propagates through the plasma, various instabilities and nonlinear phenomena such as self-focusing, filamentation, laser pulse distortion, stimulated Raman scattering, stimulated Brillouin scattering, two plasmon decay etc. take place, [6] which degrade the yield of these applications. To achieve the maximum yield of these applications, the laser-plasma system should be free of the parametric instabilities. Therefore, the study of the propagation of ultraintense laser pulses through plasmas is of great interest in laser plasma interactions. Self-focusing is the most important nonlinear process in laser-plasma interactions, [7][8][9][10][11][12][13][14][15] which is induced by the change in the refractive index of plasma exposed to intense laser radiation. This process affects the uniformity of energy deposition inside the plasma and leads to seeding and growth of hydrodynamic instabilities. The problem of self-focusing of laser radiation in plasma has been the subject of intense study since the last few decades. The nature of the self-focusing is strongly affected by the intensit...

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“…Recently, the self-focusing issue has been studied by several researchers, both theoretically and experimentally. Patil et al (2013) studied propagation of the Gaussian laser beam in a plasma. They investigated the nonlinear differential equation for the beam width parameter using a parabolic equation approach and solved it numerically.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear interaction of intense left- and right-hand polarized laser pulse with hot magnetized plasma

Abedi‐Varaki

Jafari

2017

J. Plasma Phys.

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In this article, self-focusing of an intense circularly polarized laser pulse in the presence of an external oblique magnetic field in hot magnetized plasma, using Maxwell’s equations and the relativistic fluid momentum equation, is studied. An envelope equation governing the spot size of the laser beam for both of left- and right-hand polarizations has been derived and the effects of the plasma temperature and oblique magnetic field on the electron density distribution of hot plasma with respect to variation of the normalized laser spot size has been investigated. Numerical results depict that in right-hand polarization, self-focusing of the laser pulse along the propagation direction in hot magnetized plasma becomes better and more compressed with increasing $\unicode[STIX]{x1D703}$. Inversely, in left-hand polarization, increase of $\unicode[STIX]{x1D703}$ in an oblique magnetic field leads to enhancement of the spot size and reduction self-focusing. Besides, in the plasma density profile, self-focusing of the laser pulse improves in comparison with no oblique magnetic field. Also it is shown that plasma temperature has a key role in the laser spot size, normalized laser output power and the variation of plasma density.

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Combined effect of ponderomotive and relativistic self-focusing on laser beam propagation in a plasma

Cited by 76 publications

References 31 publications

Nonlinear Propagation of Gaussian Laser Beam in Magnetized Plasma: Effect of Oblique Magnetic Field

Nonlinear Propagation of Gaussian Laser Beam in Magnetized Plasma: Effect of Oblique Magnetic Field

Self‐focusing of a cosh‐Gaussian laser beam in magnetized plasma under relativistic‐ponderomotive regime

Nonlinear interaction of intense left- and right-hand polarized laser pulse with hot magnetized plasma

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