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

Liang, Hao; Hu, Xiaoyan; Zheng, Chunyang; Li, B.; Xiang, Jin; Liu, Z. J.

doi:10.1017/s0263034616000082

Cited by 9 publications

(3 citation statements)

References 32 publications

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“…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%

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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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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“…This leads to complex multibeam laserplasma instabilities. One important example is crossed-beam energy transfer (CBET) between two beams [4][5][6][7][8], which can redistribute laser energy, alter drive symmetry, and modify hydrodynamic conditions. Apart from CBET, the collective light can be reamplified and enhanced significantly due to the contributions of the collective instabilities [12].…”

Section: Introductionmentioning

confidence: 99%

Collective stimulated Brillouin scattering with shared ion acoustic wave under the action of two overlapping laser beams

Qiu¹,

Liang²,

Cao³

et al. 2021

Plasma Phys. Control. Fusion

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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 collective SBS with shared IAW 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 collective SBS modes with shared IAW 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. Furthermore, the out-of-plane modes, in which the wavevectors of daughter waves lie in different planes from the two overlapped beams, are found to be important for certain polarization states and crossing angles of the laser beams. This work is helpful to comprehend and estimate the collective SBS with shared IAW in ICF experiments.

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“…This leads to complex multibeam laserplasma instabilities. One important example is crossed-beam energy transfer (CBET) between two beams [3][4][5][6][7], which can redistribute laser energy, alter drive symmetry, and modify hydrodynamic conditions. 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.…”

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.

show abstract

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

Cited by 9 publications

References 32 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

Collective stimulated Brillouin scattering with shared ion acoustic wave under the action of two overlapping laser beams

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

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