Electromagnetic beam profile dynamics in collisional plasmas

Sharma, Ashutosh; Borhanian, Jafar; Kourakis, Ioannis

doi:10.1088/1751-8113/42/46/465501

Cited by 31 publications

(18 citation statements)

References 40 publications

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“…Here, we follow the paraxial approach which was introduced by Akhmanov et al [57] and extended in Ref. [61] by Sodha et al and revisited by Sharma et al [62].…”

Section: Basic Formulationmentioning

confidence: 99%

Spatiotemporal Evolution of Intense Short Gaussian Laser Pulses in Weakly Relativistic Magnetized Plasma

Olumi

Maraghechi

2016

Contrib. Plasma Phys.

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Key words High-intensity lasers, ultra-short pulses, relativistic nonlinearity, self-focusing in plasma, selfcompression in plasma.The weakly relativistic regime of propagation of a short and intense laser pulse in the magnetized plasma is investigated. By considering relativistic nonlinearity and using non-linear Schrödinger equation with paraxial approximation, two second-order coupled differential equations are obtained for the longitudinal pulse width parameter (in time) and for the transverse pulse width parameter (in space). The simultaneous evolution of spot size and length of a relativistic Gaussian laser pulse in a magnetized plasma can be calculated by the numerical solution of the equations. The effect of magnetic field is investigated. It is observed that in the presence of magnetic field both the self-compression and the self-focusing can be enhanced. Furthermore, the interplay between the longitudinal self-compression and the transverse self-focusing in a magnetized plasma is investigated.

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“…Here, we follow the paraxial approach which was introduced by Akhmanov et al [57] and extended in Ref. [61] by Sodha et al and revisited by Sharma et al [62].…”

Section: Basic Formulationmentioning

confidence: 99%

Spatiotemporal Evolution of Intense Short Gaussian Laser Pulses in Weakly Relativistic Magnetized Plasma

Olumi

Maraghechi

2016

Contrib. Plasma Phys.

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“…The first approach is the variational method [29][30][31] and the second one is the paraxial approximation approach. 2,[19][20][21] Both of these two approaches assume the NLSE has a solution…”

Section: Pulse Width Evolutionmentioning

confidence: 99%

“…The nonlinear dependence of the axial phase velocity induces a frequency chirp, which gives rise to an axial chirp of the group velocity, i.e., the front of the pulse with lower frequency moves more slowly and the back of the pulse with higher frequency progresses faster, which result in the compression of the laser pulse. 2 Recently, the laser compression effect has been investigated extensively, for example, the self-compression of a relativistic Gaussian laser pulse propagating in a nonuniform plasma, 2 the compression of a finite extent Gaussian laser pulse in collisional plasma, 19 and the pulse compression in the electron-positron-ion plasma. 20 The dynamics of dark hollow Gaussian laser pulses in relativistic plasma including the pulse compression effect are also researched in Ref.…”

Section: Introductionmentioning

confidence: 99%

Relativistic laser pulse compression in magnetized plasmas

et al. 2015

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The self-compression of a weak relativistic Gaussian laser pulse propagating in a magnetized plasma is investigated. The nonlinear Schrödinger equation, which describes the laser pulse amplitude evolution, is deduced and solved numerically. The pulse compression is observed in the cases of both left- and right-hand circular polarized lasers. It is found that the compressed velocity is increased for the left-hand circular polarized laser fields, while decreased for the right-hand ones, which is reinforced as the enhancement of the external magnetic field. We find a 100 fs left-hand circular polarized laser pulse is compressed in a magnetized (1757 T) plasma medium by more than ten times. The results in this paper indicate the possibility of generating particularly intense and short pulses.

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“…Such reduction of the pulse duration to T Շ 10 Â 10 À15 s, which corresponds to the pulse length of mere 3-4 laser wavelengths, i.e., L z Շ 3 lm, might be achieved using various techniques, such as the transition through periodic plasma-vacuum structures and plasma lenses, 12,13 self-focusing by the plasma wake 11,37,38 or nonuniform Ohmic heating by the laser pulse, see Ref. 39 and references therein. Together with a slight reduction of the spot diameter, readily available at present time, this would bring us to the verge of the SIR, but still retaining the pancake form of the pulse.…”

Section: Mathematical Modelmentioning

confidence: 99%

Semianalytical study of the propagation of an ultrastrong femtosecond laser pulse in a plasma with ultrarelativistic electron jitter

et al. 2015

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The interaction of a multi-petawatt, pancake-shaped laser pulse with an unmagnetized plasma is studied analytically and numerically in a regime with ultrarelativistic electron jitter velocities, in which the plasma electrons are almost completely expelled from the pulse region. The study is applied to a laser wakefield acceleration scheme with specifications that may be available in the next generation of Ti:Sa lasers and with the use of recently developed pulse compression techniques. A set of novel nonlinear equations is derived using a three-timescale description, with an intermediate timescale associated with the nonlinear phase of the electromagnetic wave and with the spatial bending of its wave front. They describe, on an equal footing, both the strong and the moderate laser intensity regimes, pertinent to the core and to the edges of the pulse. These have fundamentally different dispersive properties since in the core the electrons are almost completely expelled by a very strong ponderomotive force, and the electromagnetic wave packet is imbedded in a vacuum channel, thus having (almost) linear properties. Conversely, at the pulse edges, the laser amplitude is smaller, and the wave is weakly nonlinear and dispersive. New nonlinear terms in the wave equation, introduced by the nonlinear phase, describe without the violation of imposed scaling laws a smooth transition to a nondispersive electromagnetic wave at very large intensities and a simultaneous saturation of the (initially cubic) nonlocal nonlinearity. The temporal evolution of the laser pulse is studied both analytically and by numerically solving the model equations in a two-dimensional geometry, with the spot diameter presently used in some laser acceleration experiments. The most stable initial pulse length is estimated to exceed 1.5–2 microns. Moderate stretching of the pulse in the direction of propagation is observed, followed by the development of a vacuum channel and of a very large electrostatic wake potential, as well as by the bending of the laser wave front

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Electromagnetic beam profile dynamics in collisional plasmas

Cited by 31 publications

References 40 publications

Spatiotemporal Evolution of Intense Short Gaussian Laser Pulses in Weakly Relativistic Magnetized Plasma

Spatiotemporal Evolution of Intense Short Gaussian Laser Pulses in Weakly Relativistic Magnetized Plasma

Relativistic laser pulse compression in magnetized plasmas

Semianalytical study of the propagation of an ultrastrong femtosecond laser pulse in a plasma with ultrarelativistic electron jitter

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