Suppression of stimulated Brillouin scattering in laser beam hot spots

The filamentation of the high-power laser beam is investigated by taking off axial contribution when relativistic nonlinearity is considered. The effect of filamentation of the laser beam is studied on the localization of the electron plasma wave (EPW) and on the stimulated Raman scattering (SRS). The semi-analytical solution of the nonlinearly coupled EPW equation in the presence of laser beam filaments has been found. It is observed that due to this nonlinear coupling between two waves, localization of EPW takes place. This localization of EPW affects the Eigen frequency and damping of plasma wave. The new enhanced damping of the plasma wave has been calculated and it is found that the SRS process gets suppressed due to the localization of plasma wave in laser beam filamentary structures. For typical laser beam and plasma parameters with wavelength λ (=1064 nm), power flux (=1018 W cm−2) and plasma density n/ncr (=0.2); the SRS back reflectivity is found to be suppressed by a factor of approximately 8%.

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“…The solution of (20) is assumed as Substituting this solution in eigen value (20), one obtains after following [37]:…”

Section: Excitation Of Electron Plasma Wavementioning

confidence: 99%

“…By using (29), (32), (33), (35a), (37), (38) the expression for back reflectivity R = |E S | 2 /|E 00 | 2 is obtained as (by taking into account the finite beam size of the pump and scattered laser beam when relativistic nonlinearity is operative):…”

Section: Stimulated Raman Scatteringmentioning

confidence: 99%

Suppression of stimulated Raman scattering at ultra relativistic laser power: Effect of localization

Gupta

Sharma²,

Sharma

et al. 2010

J. Plasma Phys.

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“…SBS is the process in which an incident electromagnetic wave interacts with the plasma ion acoustic wave (IAW) fluctuations [9,10]. The coupling between them generates a scattered electromagnetic wave, which develops in time and space and results in the growth of a resonant IAW [11][12][13][14][15][16][17]. This process can take place at electron density below the critical plasma density (n r ); although under certain conditions, it may be localized to the lower plasma densities.…”

Section: Introductionmentioning

confidence: 99%

Temporal characteristics of relativistic stimulated Brillouin scattering of a laser in plasmas

Yadav¹,

Gupta²

2019

Laser Phys. Lett.

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This article presents our study of the relativistic stimulated Brillouin scattering (SBS) process of a laser in a plasma in the presence of an electron–ion collision damping coefficient by following the energy and momentum conservation. The change in plasma density and the inclusion of the damping coefficient of the electron–ion collision modify the dispersion relations of the pump wave, ion acoustic wave, and sideband waves; consequently, the temporal characteristics of the interacting waves have been affected. The electron–ion collisions and relativistic mass effect are seen to be important to the temporal characteristics of the interacting waves. In this work, we primarily introduce the physical model of SBS under different plasma parameter conditions. The influence of collisional plasma parameters on the temporal evolution of SBS is analyzed. This work may be crucial to understand laser energy transfer in the hohlraum plasma in inertial confinement fusion.

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“…If the beat wave driven by a couple of two beams satisfies the dispersion relation of the ion-acoustic waves, energy transfers between the crossed beams through a three-wave coupling process (McKinstrie et al, 1996). This phenomenon, which is commonly named crossed-beam energy transfer (CBET), is a very important process because of its influence on the capsule implosion symmetry (Kruer et al, 1996) and other laser-plasma interaction (LPI) instabilities, such as stimulated Raman scattering (SRS) and simulated Brillouin scattering (SBS) (Karttunen & Salomaa, 1992;Kline & Montgomery, 2005;Sharma et al, 2009Sharma et al, , 2012Huller & Porzio, 2010;Hao et al, 2012;Vyas et al, 2014). During the latest decades, many experimental works about CBET have been carried out on the Nova and the Omega laser facilities (Wharton et al, 1998;Kirkwood et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Study of crossed-beam energy transfer process with large crossing angle in three-dimension

Liang

Zheng

et al. 2016

Laser Part. Beams

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In this paper, a three-dimensional (3D) model as a new module of LAP3D code is presented to study the crossed-beam energy transfer (CBET) process. This model is not limited by the paraxial approximation and can be used to deal with a large crossing angle case. Besides, this model is also appropriate for the multi-ion species conditions and even multibeams problems, which will be very helpful in relevant experiment analysis and the target design. In our 3D simulations, we take the overlapped beams with a 60°crossing angle as an example, and observe obvious energy transfer process, which indicates CBET process might occur between the incident laser beams with a large crossing angle when the matching condition is satisfied. This large crossing angle CBET process also can change the spatial shape of the beam spot, and may have some potential important influence on other laser-plasma interaction instabilities and the energy symmetry in hohlraum.

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Suppression of stimulated Brillouin scattering in laser beam hot spots

Cited by 20 publications

References 35 publications

Suppression of stimulated Raman scattering at ultra relativistic laser power: Effect of localization

Suppression of stimulated Raman scattering at ultra relativistic laser power: Effect of localization

Temporal characteristics of relativistic stimulated Brillouin scattering of a laser in plasmas

Study of crossed-beam energy transfer process with large crossing angle in three-dimension

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