Laser prepulse induced plasma channel formation in air and relativistic self focusing of an intense short pulse

Kumar, Ashok; Dahiya, Deepak; Sharma, Anamika

doi:10.1063/1.3551741

Cited by 20 publications

(6 citation statements)

References 35 publications

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“…Vhanmore et al [43] used asymmetric elegant Hermite-cosh-Gaussian to study the self-focusing in magnetized plasma. Kumar et al [44] analytically studied relativistic self-focusing and particle-in-cell simulations, which reveals that the self-focusing is less sensitive to laser amplitude variation in deeper plasma channels for millimeter range plasma channels present scheme is being valid.…”

Section: Beat Wave Schemesmentioning

confidence: 99%

Studies of Terahertz Sources and Their Applications

Singh¹,

Meena²,

Tyagi³

et al. 2022

Intelligent Electronics and Circuits - Terahertz, ITS, and Beyond

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The contributed chapter discuss the applications of terahertz radiations and its generation mechanism through laser plasma interactions. The methods of generation of terahertz radiations from plasma wake field acceleration, higher harmonic generation and the laser beat wave plasma frequency are reviewed. The nonlinear current density oscillate the plasma at beat wave frequency under the effect of ponderomotive force and excite the terahertz radiation at beat wave frequency. The current state of the arts of the methods of generation has been incorporated. The mathematical expression of ponderomotive force has been derived under the influence of gradient of laser fields. In additions, the future challenge and their overcomes are also been discussed.

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Section: Beat Wave Schemesmentioning

confidence: 99%

Studies of Terahertz Sources and Their Applications

Singh¹,

Meena²,

Tyagi³

et al. 2022

Intelligent Electronics and Circuits - Terahertz, ITS, and Beyond

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“…The electron temperature increases and heats them at an average rate of

Re [- e {boldE}_{2}^{⋆} . \frac{boldv}{2}]

. The energy balance equation for the electrons is

\frac{3}{2} \frac{{dT}_{e}}{italicdt} = \frac{e^{2} {(||, {boldE}_{bold2})}^{2} ν_{normalei}}{2 m_{normale} ω_{0}^{2}} - \frac{3}{2} {δ ν}_{normalei} [T_{normale} - T_{e 0}],

where δ is the mean fraction of excess energy lost per collision, T e is the field‐dependent electron temperature, and T e0 is the equilibrium plasma temperature. We take the variation of the electron–ion collision frequency with the electron temperature as

ν_{normalei} = ν_{0} {((), \frac{T_{e}}{T_{normale 0}})}^{- \frac{3}{2}}

, where ν 0 is the electron–ion collision frequency at equilibrium plasma temperature.…”

Section: Formation Of Plasma Channelmentioning

confidence: 99%

Non‐linear interaction of a q‐Gaussian laser beam in a plasma channel created by the ignitor‐heater technique

Gupta

2018

Contributions to Plasma Physics

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This paper presents a theoretical investigation of the propagation characteristics of a q-Gaussian laser beam propagating through a plasma channel created by the ignitor-heater technique. The ignitor beam creates the plasma by tunnel-ionization of air. The heater beam heats the plasma electrons and establishes a parabolic channel. The third beam (q-Gaussian beam) is guided in the plasma channel under the combined effects of density non-uniformity and non-uniform ohmic heating of the plasma channel. Numerical solutions of the non-linear Schrodinger wave equation (NSWE) for the fields of laser beams are obtained with the help of the moment theory approach. Particular emphasis is placed on the dynamical variations of the spot size of the laser beams and the longitudinal phase shift of the guided beam with the distance of propagation. KEYWORDSoptical guiding, phase shift, plasma channel, q-Gaussian, self-focusing INTRODUCTIONWith the rapid development of laser technology, fueled by the advent of the chirped pulse amplification (CPA) technique, [1] ultra-intense lasers have become available, leading to a continuously extending research interest on laser-matter interactions. The laser intensity is always a key factor that decides the physical phenomena and intrinsic schemes. Currently, since the enhancement of laser power has gotten into a bottleneck at the order of 10 PW, secondary optical modulation and tight focusing of the laser beams have become important approaches to achieve higher power densities. However, the laser intensities and spot sizes coming from conventional solid-state optics are limited by the damage threshold and the diffraction effects, respectively. To overcome these limitations, pre-formed plasma channels have been proposed as a promising scheme, which can support high intensities and compensate diffraction. [2,3] As with an optical fibre, a plasma channel can provide optical guidance if the index of refraction peaks on the axis, which can be achieved with a plasma density profile that has a local minimum on the axis. To guide highly intense laser beams, plasma channels must be produced in deeply ionized gases, where the density profile cannot be changed by the guided beam through further ionization. An increase in the density on the axis would lead to ionization-induced refraction and hence negate the guiding. To meet these requirements, Volfbeyn et al. [3] developed a novel technique known as the ignitor-heater technique to create plasma channels for the long-range propagation of laser beams. The physics of guiding the laser beam is as follows: the ignitor beam creates a plasma by tunnel-ionization of an ambient gas. The heater beam heats the plasma and thereby creates a concave parabolic electron density profile so that the plasma density becomes minimum on the axis compared to that at the edges of the channel where the density is maximum. Therefore, the refractive index becomes a maximum on the axis and decreases towards the edges.When a third laser beam is passed through the plasma channel, ...

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“…It was shown that in the weakly relativistic regime, steady-state self-focusing is similar to self-focusing in a Kerr medium could occur. Relativistic self-focusing (RSF) was studied by many authors [40][41][42][43][44][45][46][47][48]. In Refs.…”

Section: Introductionmentioning

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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Laser prepulse induced plasma channel formation in air and relativistic self focusing of an intense short pulse

Cited by 20 publications

References 35 publications

Studies of Terahertz Sources and Their Applications

Studies of Terahertz Sources and Their Applications

Non‐linear interaction of a q‐Gaussian laser beam in a plasma channel created by the ignitor‐heater technique

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

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