HotLoop Optimization of Petawatt Laser Focal Spot via a Twin-Focus Scheme
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911700363509760 |
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| author | Wu, Qingfan Gao, Ying Wu, Minjian Zhao, Jiarui Chen, Shiyou Liang, Tianhao Chen, Haoran Song, Tan Zhang, Zhongshuai Wu, Zhangyi Xu, Shirui Peng, Ziyang Xu, Tianqi Pan, Zhuo Zhang, Yujia Han, Qihang Chen, Ke Hua, Chenghao Fan, Pengcheng Xie, Yuntian Shen, Yifei Xu, Shengxuan Ma, Liyong Geng, Yixing Lin, Chen Zhao, Yanying Yan, Xueqing Ma, Wenjun |
| author_facet | Wu, Qingfan Gao, Ying Wu, Minjian Zhao, Jiarui Chen, Shiyou Liang, Tianhao Chen, Haoran Song, Tan Zhang, Zhongshuai Wu, Zhangyi Xu, Shirui Peng, Ziyang Xu, Tianqi Pan, Zhuo Zhang, Yujia Han, Qihang Chen, Ke Hua, Chenghao Fan, Pengcheng Xie, Yuntian Shen, Yifei Xu, Shengxuan Ma, Liyong Geng, Yixing Lin, Chen Zhao, Yanying Yan, Xueqing Ma, Wenjun |
| contents | Achieving diffraction-limited focusing of high-power laser pulses to generate ultra-high intensities is crucial for developing compact laser-driven particle accelerators and exploring strong-field quantum electrodynamics. However, accurately diagnosing and optimizing the focal spots of petawatt (PW) laser pulses remains a significant challenge. In this work, we present an experimental methodology utilizing a twin-focus scheme to precisely characterize the intensity distribution and wavefront of focused PW femtosecond laser pulses, and employ it to elucidate their power-dependent evolution. Furthermore, we optimized the focal spots at full power via our in-situ wavefront correction method termed ``HotLoop', achieving a Strehl ratio of 0.80 for 1 PW laser pulses. Consequently, the cutoff proton energies in laser proton acceleration experiments were significantly enhanced. The success of this approach underscores the necessity of in-situ high-energy wavefront correction for ultra-high intensity laser-matter interactions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_20647 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | HotLoop Optimization of Petawatt Laser Focal Spot via a Twin-Focus Scheme Wu, Qingfan Gao, Ying Wu, Minjian Zhao, Jiarui Chen, Shiyou Liang, Tianhao Chen, Haoran Song, Tan Zhang, Zhongshuai Wu, Zhangyi Xu, Shirui Peng, Ziyang Xu, Tianqi Pan, Zhuo Zhang, Yujia Han, Qihang Chen, Ke Hua, Chenghao Fan, Pengcheng Xie, Yuntian Shen, Yifei Xu, Shengxuan Ma, Liyong Geng, Yixing Lin, Chen Zhao, Yanying Yan, Xueqing Ma, Wenjun Optics Plasma Physics Achieving diffraction-limited focusing of high-power laser pulses to generate ultra-high intensities is crucial for developing compact laser-driven particle accelerators and exploring strong-field quantum electrodynamics. However, accurately diagnosing and optimizing the focal spots of petawatt (PW) laser pulses remains a significant challenge. In this work, we present an experimental methodology utilizing a twin-focus scheme to precisely characterize the intensity distribution and wavefront of focused PW femtosecond laser pulses, and employ it to elucidate their power-dependent evolution. Furthermore, we optimized the focal spots at full power via our in-situ wavefront correction method termed ``HotLoop', achieving a Strehl ratio of 0.80 for 1 PW laser pulses. Consequently, the cutoff proton energies in laser proton acceleration experiments were significantly enhanced. The success of this approach underscores the necessity of in-situ high-energy wavefront correction for ultra-high intensity laser-matter interactions. |
| title | HotLoop Optimization of Petawatt Laser Focal Spot via a Twin-Focus Scheme |
| topic | Optics Plasma Physics |
| url | https://arxiv.org/abs/2605.20647 |