Thermal behavior change in the self-focusing of an intense laser beam in magnetized electron-ion-positron plasma

Javan, N. Sepehri; Azad, M. Hosseinpour

doi:10.1017/s0263034614000184

Cited by 13 publications

(7 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To determine the effect of temperature on SF, in figure 6, we show the variations of the spot size parameter with respect to the propagation distance for two different temperatures, related to vT = 0.02 and vT = 2, corresponding to T = 5KeV and T = 500KeV, respectively. We note that increase in the temperature causes a decrease in the SF, which is in agreement with the results of previous investigations of the circularly-polarized laser beam SF in magnetized hot plasma [54,76].…”

Section: Numerical Analysissupporting

confidence: 92%

“…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%

“…The SF of a relativistic laser beam in magnetized hot plasma for individual modes of EMWs, i.e. circularly-polarized right-(CPR) and left-hand (CPL) modes, during non-linear propagation along the external magnetic field, has previously been theoretically studied by Sepehri Javan and coworkers, [51,54]. Given that linear-polarization is not the normal mode of the magnetized plasma, we consider it as the combination of medium normal modes, namely CPR and CPL modes, a factor neglected by some authors (cf reference [50], where the SF of the linearly-polarized laser beam is considered in magnetized plasma).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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.

show abstract

Section: Numerical Analysissupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

show abstract

“…This phenom enon often occurs when an intense electromagnetic radiation generated by femtosecond lasers propagates through many solids, liquids and gases. Related to the structure of the medium and the laser intensity, several mechanisms may produce variations in the refractive index, which leads to the self-focusing [17]. The most common physical effects that manifest the selffocusing phenomenon are collisional [18], ponderomotive [19], relativistic [20] and heating type effects [21].…”

Section: Introductionmentioning

confidence: 99%

Effects of the helical magnetic wiggler on a laser beam interacting with a lattice of metallic nanoparticles: plasmonic and body waves

Siahmazgi

Jafari

2019

Laser Phys. Lett.

View full text Add to dashboard Cite

In this study, the influence of a helical magnetic wiggler on the nonlinear interaction of a laser beam with a lattice of metallic nanoparticles is investigated. Coupling of the static magnetic field of the wiggler to the field of the laser wave, and therefore a change in the electric field intensity of the pumped wave, leads to the formation of a nonlinear force in the interaction region. As a consequence, the nonlinear force enhances the plasmonic oscillations of the electronic cloud of each nanoparticle causing electron density modulation, which improves the self-focusing property of the laser beam. Using a perturbative method, the nonlinear dispersion plasmonic and body waves are obtained from the interaction of a laser beam with a lattice of nanoparticles in the presence of a helical magnetic wiggler. We investigate the effects of nanoparticle size, their separations and wiggler field strength on the evolution of the transverse profile of the laser beam in both incident linearly polarized and circularly polarized waves. The numerical results indicate that in the linear polarization for all branches of plasmonic and body waves (except for the low-frequency middle branch), laser bandwidth decreases with increasing nanoparticle separation length, which improves the self-focusing property. Moreover, with enhancement of the normalized wiggler field strength, the laser amplitude transverse profile for all branches of plasmonic and body waves (except for the low-frequency middle branch) decreases, which leads to beam focusing. For left and right circular polarization, it is found that with an increase in the nanoparticle separation length, the laser amplitude transverse profile for all branches of plasmonic and body waves (except for the low-frequency middle branch) increases, which leads to beam defocusing. Furthermore, with enhancement of the normalized wiggler field strength, the laser amplitude transverse profile decreases for body waves and the low-frequency lower branch of plasmonic waves, which gives rise to the beam focusing, whereas it increases for the low-frequency middle and upper branches of plasmonic waves, which leads to the beam defocusing.

show abstract

“…[29][30][31][32][33][34][35] In this paper, we theoretically investigate the self-focusing of the circularly polarized laser beam propagating along an external magnetic field in a non-Maxwellian magnetized plasma. In a non-Maxwellian plasma, distribution of particles is far away Maxwellian.…”

mentioning

confidence: 99%

Self-focusing of circularly polarized laser pulse propagating through a magnetized non-Maxwellian plasma

Javan

2014

Physics of Plasmas

View full text Add to dashboard Cite

Articles you may be interested inWeakly relativistic and ponderomotive effects on self-focusing and self-compression of laser pulses in near critical plasmas Phys. Plasmas 21, 103107 (2014); 10.1063/1.4898057Self-focusing and stimulated Brillouin back-scattering of a long intense laser pulse in a finite temperature relativistic plasma Phys. Plasmas 20, 122117 (2013); 10.1063/1.4858896Self-focusing of a high-intensity laser in a collisional plasma under weak relativistic-ponderomotive nonlinearity Self-focusing of an intense circularly polarized laser pulse propagating through a magnetized non-Maxwellian plasma is investigated. Based on a relativistic two-fluid model, nonlinear equation describing dynamics of the slowly varying amplitude is obtained. The evolution of laser spot size is studied and effect of non-Maxwellian distribution of charge density on the spot size is considered. It is shown that the existence of super-thermal particles leads to the enhancement of the selffocusing quality of plasma. V C 2014 AIP Publishing LLC. [http://dx.

show abstract

Thermal behavior change in the self-focusing of an intense laser beam in magnetized electron-ion-positron plasma

Cited by 13 publications

References 33 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

Effects of the helical magnetic wiggler on a laser beam interacting with a lattice of metallic nanoparticles: plasmonic and body waves

Self-focusing of circularly polarized laser pulse propagating through a magnetized non-Maxwellian plasma

Contact Info

Product

Resources

About