Self-focusing of a high-intensity laser pulse by a magnetized plasma lens in sub-relativistic regime

Abari, M. Etehadi; Sedaghat, Mahsa; Hosseinnejad, Mohammad Taghi

doi:10.1007/s40094-016-0239-3

Cited by 3 publications

(2 citation statements)

References 36 publications

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“…However, high‐intensity laser pulses can propagate only up to the relativistic cutoff density into unmagnetized inhomogeneous plasma. It is well known that intense magnetic fields are generated in the laser plasma interaction and the propagation of high‐intensity laser pulses in plasma is strongly affected by the presence of magnetic fields . There have been limited studies of self‐focusing of intense laser beams in magnetized plasma.…”

Section: Introductionmentioning

confidence: 99%

“…They have shown that self‐focusing property of the laser beam enhances in the presence of external magnetic field. Abari et al have recently studied the self‐focusing of a high‐intensity laser pulse by a magnetized plasma lens in a subrelativistic regime. They concluded that the magnetized plasma lens more sufficiently decreases the laser spot size and the left‐handed circularly polarized beam is more effectively focused by a magnetized plasma lens compared to the right‐handed circularly polarized beam.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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Strong self-focusing of an intense cosh-Gaussian laser beam in magnetized plasma under relativistic effect

Purohit¹,

Raizada²

2022

J Opt

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Relativistic effects on propagation of q-Gaussian laser beam in a rippled density plasma: Application of higher order corrections

et al. 2018

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A nonparaxial investigation for propagation characteristics of q-Gaussian laser beam in rippled density plasma is studied by considering the relativistic nonlinearity. The field distribution in the medium is expressed in terms of q parameter and beam width parameter f. Nonlinear parabolic partial differential equation governing the evolution of complex envelope in slowly varying approximation is solved in a modulated density profile. Analytical theory of self-focusing including higher order terms in the expansion of dielectric function up to fourth order is developed and the variation of beam width parameter f with the distance of propagation for different parameters is studied. One may note that increased value of density ripple, laser intensity and depth of modulation, increases self-focusing whereas a lower value of q shows strong self-focusing. A comparative study between paraxial and nonparaxial study has also conducted. This study is useful for research in high energy density physics.

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Self-focusing of a high-intensity laser pulse by a magnetized plasma lens in sub-relativistic regime

Cited by 3 publications

References 36 publications

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

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

Strong self-focusing of an intense cosh-Gaussian laser beam in magnetized plasma under relativistic effect

Relativistic effects on propagation of q-Gaussian laser beam in a rippled density plasma: Application of higher order corrections

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