Single-shot in situ pulse-duration measurement using plasma grating
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866918381950599168 |
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| author | Wang, Jimin Zuo, Yanlei Zhou, Kainan Li, Zhaoli Wei, Pengyu Wang, Xiao Mu, Jie Wang, Xiaodong Zeng, Xiaoming Wu, Zhaohui Peng, Hao Riconda, C. Weber, S. |
| author_facet | Wang, Jimin Zuo, Yanlei Zhou, Kainan Li, Zhaoli Wei, Pengyu Wang, Xiao Mu, Jie Wang, Xiaodong Zeng, Xiaoming Wu, Zhaohui Peng, Hao Riconda, C. Weber, S. |
| contents | Accurate measurement of the pulse duration of ultrashort, ultra-intense laser pulses at focus is essential for strong-field science. Most existing diagnostics, however, cannot allow direct in situ measurement in the focal region because of damage-threshold limits and unavoidable spatial averaging. We present a direct single-shot far-field diagnostic based on a plasma grating. In this method, the pulse duration is encoded in the axial length of an interference-written plasma grating and retrieved from the corresponding Bragg-diffraction signal. Comparison with near-field (pre-focus) autocorrelator measurements and far-field (at-focus) scanning measurements confirms single-shot pulse-duration retrieval in the focal region over 35-130 fs, and the method remains effective at a peak intensity of $\sim 10^{16}{\rm W/cm^2}$. In principle, the measurable range can be extended to 15-300 fs and to higher peak intensities. The method is insensitive to the laser central wavelength and offers a practical approach to far-field diagnostics in high-power laser systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_10358 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Single-shot in situ pulse-duration measurement using plasma grating Wang, Jimin Zuo, Yanlei Zhou, Kainan Li, Zhaoli Wei, Pengyu Wang, Xiao Mu, Jie Wang, Xiaodong Zeng, Xiaoming Wu, Zhaohui Peng, Hao Riconda, C. Weber, S. Optics Accurate measurement of the pulse duration of ultrashort, ultra-intense laser pulses at focus is essential for strong-field science. Most existing diagnostics, however, cannot allow direct in situ measurement in the focal region because of damage-threshold limits and unavoidable spatial averaging. We present a direct single-shot far-field diagnostic based on a plasma grating. In this method, the pulse duration is encoded in the axial length of an interference-written plasma grating and retrieved from the corresponding Bragg-diffraction signal. Comparison with near-field (pre-focus) autocorrelator measurements and far-field (at-focus) scanning measurements confirms single-shot pulse-duration retrieval in the focal region over 35-130 fs, and the method remains effective at a peak intensity of $\sim 10^{16}{\rm W/cm^2}$. In principle, the measurable range can be extended to 15-300 fs and to higher peak intensities. The method is insensitive to the laser central wavelength and offers a practical approach to far-field diagnostics in high-power laser systems. |
| title | Single-shot in situ pulse-duration measurement using plasma grating |
| topic | Optics |
| url | https://arxiv.org/abs/2603.10358 |