在重叠的激光光束中产生高强度斑点

IF 4.8 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Matter and Radiation at Extremes Pub Date : 2023-03-01 DOI:10.1063/5.0123585

L. Hao, J. Qiu, W. Huo

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引用次数: 1

摘要

发现并详细研究了重叠光束耦合产生高强度散斑的新机制。利用三维模拟的方法，研究了在惯性约束核聚变研究中使用相板平滑和偏振平滑的重叠光束的耦合。研究发现，非均匀空间相位调制可以改变激光束光斑的强度分布，相位板形成的散斑可以分裂成更小、强度更高的散斑，有利于激光等离子体不稳定性的产生。在有和没有重叠入射光束耦合的情况下对受激布里渊散射进行了仿真比较，结果证实了这种机制对受激布里渊散射的增强作用。

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Generation of high intensity speckles in overlapping laser beams

A new mechanism for the generation of high intensity speckles by coupling of overlapping beams is discovered and studied in detail. Using three-dimensional simulations, the coupling of overlapping beams smoothed by phase plates and by polarization smoothing are investigated in the regime relevant to inertial confinement fusion studies. It is found that the intensity distribution of the laser beam spot can be changed by nonuniform spatial phase modulation, and the speckles formed by the phase plate can be split into smaller speckles with higher intensities, which is favorable for the generation of laser plasma instabilities. Stimulated Brillouin scattering is compared in simulations with and without coupling of the overlapping incident beams, and the results confirm the enhancement of stimulated Brillouin scattering due to this mechanism.

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来源期刊

Matter and Radiation at Extremes Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

8.60

自引率

9.80%

发文量

160

审稿时长

15 weeks

期刊介绍： Matter and Radiation at Extremes (MRE), is committed to the publication of original and impactful research and review papers that address extreme states of matter and radiation, and the associated science and technology that are employed to produce and diagnose these conditions in the laboratory. Drivers, targets and diagnostics are included along with related numerical simulation and computational methods. It aims to provide a peer-reviewed platform for the international physics community and promote worldwide dissemination of the latest and impactful research in related fields.