Experimental demonstration of broadband-laser suppression of cross-beam energy transfer
Abstract
In direct-drive inertial confinement fusion (ICF), cross-beam energy transfer (CBET) redirects a significant fraction of the incident laser energy out of the plasma. We report the experimental demonstration that broadband lasers reduce CBET-enhanced reflected-light return, performed at the low-coherence Kunwu laser facility with two crossed beams of 0.6% bandwidth and up to 550J at ∼2.6×1014 W/cm2. A coupled ray-tracing model shows that the strong CBET amplification of narrowband reflected light is much weaker under broadband illumination. In symmetric incidence condition of two orthogonal beams, the total fractional scattered energy decreases from 7.57% to 4.64%; in asymmetric incidence condition, which separates stimulated Brillouin scattering (SBS) from specular reflection, the SBS fraction decreases from 3.75% to 0.46% and the specular-reflection fraction decreases from approximately 2.2% to 1.3%. These results establish broadband lasers as an effective, experimentally validated approach to reducing energy escape through CBET-enhanced reflection in direct-drive ICF.
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BibTeX
@misc{xu2026experimental,
title = {{Experimental demonstration of broadband-laser suppression of cross-beam energy transfer}},
author = {Guoxiao Xu and Xiaoran Li and Ning Kang and Huiya Liu and Liang Hao and Zhiyuan Li and Guowei Yang and Honghai An and Xichen Zhou and Jian Wang and Lin Yi and Jun Xiong and Zhiyong Xie and Junjian Ye and Yuchun Tu and Zhiheng Fang and Guo Jia and Wei Wang and Lan Xia and Wei Feng and Lailin Ji and Xiaohui Zhao and Anle Lei and Lifeng Wang and Yanqi Gao},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.36528},
eprint = {2609.36528},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.36528},
}
RIS
TY - UNPB
TI - Experimental demonstration of broadband-laser suppression of cross-beam energy transfer
AU - Guoxiao Xu
AU - Xiaoran Li
AU - Ning Kang
AU - Huiya Liu
AU - Liang Hao
AU - Zhiyuan Li
AU - Guowei Yang
AU - Honghai An
AU - Xichen Zhou
AU - Jian Wang
AU - Lin Yi
AU - Jun Xiong
AU - Zhiyong Xie
AU - Junjian Ye
AU - Yuchun Tu
AU - Zhiheng Fang
AU - Guo Jia
AU - Wei Wang
AU - Lan Xia
AU - Wei Feng
AU - Lailin Ji
AU - Xiaohui Zhao
AU - Anle Lei
AU - Lifeng Wang
AU - Yanqi Gao
PY - 2026
DA - 2026/09/29
PB - arXiv
DO - 10.48550/arxiv.2609.36528
UR - https://arxiv.org/abs/2609.36528
AB - In direct-drive inertial confinement fusion (ICF), cross-beam energy transfer (CBET) redirects a significant fraction of the incident laser energy out of the plasma. We report the experimental demonstration that broadband lasers reduce CBET-enhanced reflected-light return, performed at the low-coherence Kunwu laser facility with two crossed beams of 0.6% bandwidth and up to 550J at ∼2.6×10^14 W/cm^2. A coupled ray-tracing model shows that the strong CBET amplification of narrowband reflected light is much weaker under broadband illumination. In symmetric incidence condition of two orthogonal beams, the total fractional scattered energy decreases from 7.57% to 4.64%; in asymmetric incidence condition, which separates stimulated Brillouin scattering (SBS) from specular reflection, the SBS fraction decreases from 3.75% to 0.46% and the specular-reflection fraction decreases from approximately 2.2% to 1.3%. These results establish broadband lasers as an effective, experimentally validated approach to reducing energy escape through CBET-enhanced reflection in direct-drive ICF.
ER -