Stimulated Brillouin scattering of a laser beam in a plasma channel

Agarwal, Renu; Tripathi, V. K.; Agarwal, P. C.

doi:10.1109/27.491751

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…The laser also imparts an oscillatory velocity v 0 = e E/miω to plasma electrons and exerts a ponderomotive force on them creating a modified density profile [28]…”

Section: Third Harmonic Current Densitymentioning

confidence: 99%

Effect of self-focusing on laser third harmonic generation in a clustered gas

Parashar¹

2008

Phys. Scr.

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An intense Gaussian laser beam propagating through a gas embedded with atomic clusters creates a nanoplasma medium which supports self focusing of the laser beam. The laser beam produces a third harmonic due to nonlinear electron response. The efficiency of the process is sensitive to the focusing of the fundamental laser beam. The harmonic generation yield increases as the clusters expand under hydrodynamic pressure and attains a maximum at the instant when plasma density inside clusters equals three times the critical density. Further, the self-focusing of the laser enhances the efficiency of harmonic generation by ten times.

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“…The laser also imparts an oscillatory velocity v 0 = e E/miω to plasma electrons and exerts a ponderomotive force on them creating a modified density profile [28]…”

Section: Third Harmonic Current Densitymentioning

confidence: 99%

Effect of self-focusing on laser third harmonic generation in a clustered gas

Parashar¹

2008

Phys. Scr.

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“…The radial variation in density modifies the refractive index of the plasma experienced by the laser. The index of refraction will be maximum on the axis which causes the laser to converge and results in focusing of the laser pulse (Agarwal et al 1996, Volfbeyn et al 1999, Kim et al 2004, Ohkubo et al 2006. Thus a parabolic plasma channel has been utilized extensively to guide a laser pulse in a plasma.…”

Section: Introductionmentioning

confidence: 99%

Evolution of laser pulse shape in a parabolic plasma channel

2016

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During high-intensity laser propagation in a plasma, the group velocity of a laser pulse is subjected to change with the laser intensity due to alteration in refractive index associated with the variation of the nonlinear plasma density. The pulse front sharpened while the back of the pulse broadened due to difference in the group velocity at different parts of the laser pulse. Thus the distortion in the shape of the laser pulse is expected. We present 2D particle-in-cell simulations demonstrating the controlling the shape distortion of a Gaussian laser pulse using a parabolic plasma channel. We show the results of the intensity distribution of laser pulse in a plasma with and without a plasma channel. It has been observed that the plasma channel helps in controlling the laser pulse shape distortion. The understanding of evolution of laser pulse shape may be crucial while applying the parabolic plasma channel for guiding the laser pulse in plasma based accelerators.

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“…Stimulated Brillouin scattering (SBS) is a major parametric instability encountered in a variety of laser-produced plasmas [1,2]. In this process, laser radiation of frequency ω 0 and wavenumber k 0 , propagating through a plasma of density less than critical, couples to an ion acoustic wave (ω, k) and a sideband electromagnetic wave (ω 1 , k 1 ), where ω 1 = ω − ω 0 and k 1 = k − k 0 [3].…”

Section: Introductionmentioning

confidence: 99%

Stimulated Brillouin scattering at the second harmonic of a laser in two-ion-species plasma

Yadav¹,

Kaur²,

Tripathi³

2008

Phys. Scr.

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A high power laser (ω 0 , k 0 ), propagating through a two-ion-species plasma, produces oscillatory electron velocity at the second harmonic due to V × B force. This velocity parametrically couples an ion acoustic wave (ω, k) and a scattered electromagnetic wave (ω 1 , k 1 ), where ω 1 = ω − 2ω 0 , k 1 = k − 2k 0 causing second harmonic Brillouin scattering. The growth rate, far above the threshold, scales linearly with laser intensity. It has maximum growth rate slightly tilted to side scattering and vanishes for back scattering. The presence of light ion species introduces linear damping on the ion mode, diminishing the growth rate of the parametric instability.

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Stimulated Brillouin scattering of a laser beam in a plasma channel

Cited by 6 publications

References 10 publications

Effect of self-focusing on laser third harmonic generation in a clustered gas

Effect of self-focusing on laser third harmonic generation in a clustered gas

Evolution of laser pulse shape in a parabolic plasma channel

Stimulated Brillouin scattering at the second harmonic of a laser in two-ion-species plasma

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