Diagnosis of focal spots at relativistic intensity utilizing coherent radiation from laser-driven flying electron sheets
Experimental validation of laser intensity is particularly important for the study of fundamental physics at extremely high intensities. However, reliable diagnosis of the focal spot and peak intensity faces huge challenges. In this work, we demonstrate for the first time that the coherent radiation farfield patterns from laser–foil interactions can serve as an in situ, real-time, and easy-to-implement diagnostic for an ultraintense laser focus. The laser-driven electron sheets, curved by the spatially varying laser field and leaving the targets at nearly the speed of light, produce doughnut-shaped patterns depending on the shapes of the focal spot and the absolute laser intensities. Assisted by particle-in-cell simulations, we can achieve measurements of the intensity and the focal spot, and provide immediate feedback to optimize the focal spots for extremely high intensity.
Authors
- Y M Zhang (ORCID: https://orcid.org/0009-0002-8416-221X)
- Zhusong Mei (ORCID: https://orcid.org/0000-0002-1153-8944)
- Jundong Shen
- Jiarui Zhao (ORCID: https://orcid.org/0000-0002-4309-564X)
- Tianqi Xu (ORCID: https://orcid.org/0000-0003-3256-3820)
- Chen Lin (ORCID: https://orcid.org/0000-0001-9049-3002)
- Yulan Liang
- Zhuo Pan (ORCID: https://orcid.org/0000-0002-3864-2274)
- Qingfan Wu (ORCID: https://orcid.org/0009-0008-6768-6699)
- Qihang Han (ORCID: https://orcid.org/0009-0002-5900-7744)
- Tan Song
- Wenjun Ma (ORCID: https://orcid.org/0000-0001-8217-8301)
- Shiyou Chen (ORCID: https://orcid.org/0000-0002-4039-8549)
- Shirui Xu (ORCID: https://orcid.org/0000-0003-2094-8862)
- Xueqing Yan (ORCID: https://orcid.org/0000-0002-2437-6577)
- Ying Gao (ORCID: https://orcid.org/0000-0002-5912-0248)
- Hao Chen (ORCID: https://orcid.org/0009-0001-6480-7976)
- Xuan Liu (ORCID: https://orcid.org/0000-0002-5024-3524)
- Zihao Zhang (ORCID: https://orcid.org/0009-0007-9502-3713)
- Zhipeng Liu (ORCID: https://orcid.org/0000-0002-0161-6267)
- Kun Zhu
- Xun Chen (ORCID: https://orcid.org/0000-0001-7961-7908)
- Ziyang Peng (ORCID: https://orcid.org/0009-0000-3772-5126)
- Chenghao Hua
- Yanying Zhao
Institutions
- Shanxi University (CN)
- Peking University (CN)
- State Key Laboratory of Nuclear Physics and Technology
Publication Details
- Journal
- Matter and Radiation at Extremes
- Published
- 2025-02-10
- DOI
- https://doi.org/10.1063/5.0255211
- Citations
- 2
- Primary Topic
- Laser-Plasma Interactions and Diagnostics
- Type
- article
- Field-Weighted Citation Impact
- 3.74
Funders
- National Natural Science Foundation of China
- National Science Fund for Distinguished Young Scholars