Generation of high intensity speckles in overlapping laser beams

Hao Liang; Qiu Jie; Huo Wen Yi

doi:10.1063/5.0123585

Volume 8 Issue 2

Mar. 2023

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Hao Liang, Qiu Jie, Huo Wen Yi. Generation of high intensity speckles in overlapping laser beams[J]. Matter and Radiation at Extremes, 2023, 8(2): 025903. doi: 10.1063/5.0123585

Citation:

Hao Liang, Qiu Jie, Huo Wen Yi. Generation of high intensity speckles in overlapping laser beams[J]. Matter and Radiation at Extremes, 2023, 8(2): 025903. doi: 10.1063/5.0123585

Hao Liang, Qiu Jie, Huo Wen Yi. Generation of high intensity speckles in overlapping laser beams[J]. Matter and Radiation at Extremes, 2023, 8(2): 025903. doi: 10.1063/5.0123585

Citation:

Hao Liang, Qiu Jie, Huo Wen Yi. Generation of high intensity speckles in overlapping laser beams[J]. Matter and Radiation at Extremes, 2023, 8(2): 025903. doi: 10.1063/5.0123585

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Generation of high intensity speckles in overlapping laser beams

doi: 10.1063/5.0123585

Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100094, China

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Corresponding author: a)Author to whom correspondence should be addressed: huo_wenyi@iapcm.ac.cn
Received Date: 2022-08-31
Accepted Date: 2023-01-22

Available Online: 2023-03-01

Publish Date: 2023-03-01

Abstract

Abstract

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.

The authors have no conflicts to disclose.
Conflict of Interest
Liang Hao: Conceptualization (lead); Data curation (lead); Formal analysis (lead); Funding acquisition (equal); Investigation (lead); Methodology (equal); Software (lead); Visualization (lead); Writing – original draft (lead). Jie Qiu: Methodology (equal); Validation (lead); Writing – review & editing (supporting). W. Y. Huo: Conceptualization (supporting); Funding acquisition (equal); Project administration (lead); Supervision (lead); Writing – original draft (supporting); Writing – review & editing (lead).
Author Contributions
The data that support the findings of this study are available from the corresponding author upon reasonable request.

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References(50)

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