Experimental Evidence of the Collective Brillouin Scattering of Multiple Laser Beams Sharing Acoustic Waves

Neuville, C.; Tassin, V.; Pesme, D.; Monteil, M. C.; Masson-Laborde, Paul-Edouard; Baccou, C.; Fremerye, P.; Philippe, F.; Seytor, P.; Teychenné, D.; Seka, W.; Katz, J.; Bahr, R.; Depierreux, S.

doi:10.1103/physrevlett.116.235002

Cited by 25 publications

(15 citation statements)

References 23 publications

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“…The combination of Eq. ( 23) with (24) shows that C ∝ δn 0 /n c and therefore, to leading order in δn 0 /n c , C may be neglected when averaging Eq. ( 23), giving…”

Section: Forward Scattering Of a Spatially Smoothed Laser Pulse A Kinetic And Fluid Dispersion Relationsmentioning

confidence: 99%

“…A better control of the laser propagation has been achieved experimentally by the use of Spectral Dispersion (SSD) and Random Phase Plates (RPP) optical smoothing techniques [7][8][9][10] and have been considered efficient to mitigate filamentation instability [11][12][13][14], beam bending [15][16][17][18] and forward Brillouin. To date, only stimulated backward Raman or Brillouin instabilities [19,20], cross beam energy transfer [21], two plasmon decay [22,23] or collective scattering [24,25], are identified as critical issues in ICF, and remain active area of research. However, the small mitigation of cross beam energy transfer [26] and backward Brillouin scattering by laser smoothing techniques may presage similar tendencies concerning the forward scattering.…”

Section: Introductionmentioning

confidence: 99%

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Forward scattering and filamentation of a spatially smoothed laser pulse in the hydrodynamic and kinetic frameworks

et al. 2021

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We address the scattering of a high energy laser pulse on a large wavelength acoustic turbulence of relevance for LMJ or NIF-class experiments. Both kinetic and hydrodynamic frameworks are adopted and combined with a linearized description of the laser propagation. The resulting dispersion relations display important kinetic contributions to the growth of the Forward Brillouin instability. Moreover, proof is made that the spatial incoherence often used in high energy laser facilities are, for cold enough plasmas or in the multi-ion species case, not enough to reach full control of the laser filamentation. Comparisons with experimental results and dedicated hydrodynamic simulations confirm our results. The derived dispersion relations present unique tools for assessing the propagation quality and energy deposition region of high energy laser pulses. They also underline the importance of accounting correctly for kinetic effects, even in the millimeters and nanoseconds scale of many ICF or high-energy-density experiments.

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“…The combination of Eq. ( 23) with (24) shows that C ∝ δn 0 /n c and therefore, to leading order in δn 0 /n c , C may be neglected when averaging Eq. ( 23), giving…”

Section: Forward Scattering Of a Spatially Smoothed Laser Pulse A Kinetic And Fluid Dispersion Relationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Forward scattering and filamentation of a spatially smoothed laser pulse in the hydrodynamic and kinetic frameworks

et al. 2021

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“…由于多路激光的"协同" 作用, 多光束LPI过程往往具有很强的非一维、非线性特征, 这与单束激光LPI有较大的差异. 束间能量转移 (Cross-Beam Energy Transfer, CBET)就是一种典型的双光束LPI过程 [99] [97,98] . 这类过程由于光束数量多, 触发不稳定性 Figure 7 (Color online) The anti-correlation between SRS and SBS with hohlraum gas-fill density on Shenguang-III prototype gas-filled hohlraum shots.…”

Section: 激光电场一般可以定义为如下形式unclassified

“…范畴下提出了多种可能的不稳定性机制, 如共用电子等离子体波的双等离子体衰变(Two Plasmon Decay, TPD)和SRS [97,98] 、共用离子声波的SBS [99] 、残余激光作为增益种子由对面光束激发SBS等 [100] 等离子体波沉积了很多能量在激光注入孔附近等 [101] .…”

Section: 与预期存在较大偏离以来研究人员已经在多光束Lpiunclassified

Laser plasma instability in indirect-drive inertial confinement fusion

Yang¹,

Li²,

Li³

et al. 2018

Sci. Sin.-Phys. Mech. Astron.

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In indirect-drive inertial confinement fusion (ICF), the incident laser beam could excite laser plasma instabilities (LPI) such as stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS) and two plasmon decay (TPD) besides gently heat the hohlraum through collisional absorption. These instabilities would largely reduce the X-ray conversion and degrade the drive symmetry of the radiation environment. In addition, when the amplitude of parametric instability increases to a certain level, there would be interplay between different instabilities, which makes LPI complicated and unpredictable. Therefore, LPI has become one of the major challenge in achieving ignition. LPI research during recent few years made great strides in identifying, understanding, and controlling instabilities in the context of laser fusion. This paper reviews the progress in this important field according to laser (L), plasma (P), and instability (I). Prospects for the application of our improved understanding for indirect drive ICF and some exciting research opportunities are also discussed.

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“…Apart from CBET, the collective stimulated Brillouin scattering (SBS) and the collective stimulated Raman scattering (SRS) of multiple beams with shared daughter waves can also be important, since the temporal growth rate and convective gain are expected to depend on the combined laser intensities. Experimentally, it is observed that the energy amplification factor increases with the number of pump beams and significant scattered light losses are produced in novel backward directions due to the collective coupling [8][9][10][11][12]. Thus the laser-target coupling is significantly impaired.…”

Section: Introductionmentioning

confidence: 99%

Collective stimulated Brillouin scattering modes of two crossing laser beams with shared ion acoustic wave

Qiu¹,

Liang²,

Cao³

et al. 2021

Preprint

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The overlapping of multiple beams is common in inertial confinement fusion (ICF), making the collective stimulated Brillouin scattering (SBS) with shared ion acoustic wave (IAW) potentially important because of the effectively larger laser intensities to drive the instability. In this work, based on a linear kinetic model, an exact analytic solution for the convective amplification of SBS with the shared IAW modes stimulated by two overlapped beams is presented. From this solution, effects of the wavelength difference, crossing angle, polarization states, and finite beam overlapping volume of the two laser beams on the shared IAW modes are studied. It is found that a wavelength difference of several nanometers between the laser beams has negligible effects, except for a very small crossing angle about one degree. However, the crossing angle, beam polarization states, and finite beam overlapping volume can have significant influences on the shared IAW modes.Furthermore, the out-of-plane modes, in which the wavevectors of daughter waves lie in the different planes from the two overlapped beams, is found to be important for certain polarization states and crossing angles of the laser beams with the finite beam overlapping volume. This work is helpful to comprehend and estimate the collective SBS with shared IAW in ICF experiments.

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Experimental Evidence of the Collective Brillouin Scattering of Multiple Laser Beams Sharing Acoustic Waves

Cited by 25 publications

References 23 publications

Forward scattering and filamentation of a spatially smoothed laser pulse in the hydrodynamic and kinetic frameworks

Forward scattering and filamentation of a spatially smoothed laser pulse in the hydrodynamic and kinetic frameworks

Laser plasma instability in indirect-drive inertial confinement fusion

Collective stimulated Brillouin scattering modes of two crossing laser beams with shared ion acoustic wave

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