Submicrometer focusing of isolated attosecond XUV pulses approaching 10$^{16}$ W/cm$^2$
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866910173371564032 |
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| author | Imasaka, Kotaro Dong, Dianhong Kanda, Natsuki Xue, Bing Egawa, Satoru Hosobata, Takuya Yamagata, Yutaka Nabekawa, Yasuo Takahashi, Eiji J. |
| author_facet | Imasaka, Kotaro Dong, Dianhong Kanda, Natsuki Xue, Bing Egawa, Satoru Hosobata, Takuya Yamagata, Yutaka Nabekawa, Yasuo Takahashi, Eiji J. |
| contents | We demonstrate submicrometer focusing of isolated attosecond pulses (IAPs) in the extreme ultraviolet (XUV) region using a custom ellipsoidal mirror. The obtained focal spot sizes were verified using knife-edge measurements with a sharp silicon edge, confirming reproducible dimensions down to 0.46 $μ$m $\times$ 0.36 $μ$m (FWHM), approaching the diffraction limit. Focusing a 1.1-GW tabletop IAP source yields a peak intensity of 3 $\times$ 10$^{15}$ W/cm$^2$, and a realistic pathway toward 10$^{16}$ W/cm$^2$ is obtained by optimizing the beamline throughput. These results establish a practical route toward attosecond nonlinear optics in both gas and solid phases, driven by intense XUV fields. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_25485 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Submicrometer focusing of isolated attosecond XUV pulses approaching 10$^{16}$ W/cm$^2$ Imasaka, Kotaro Dong, Dianhong Kanda, Natsuki Xue, Bing Egawa, Satoru Hosobata, Takuya Yamagata, Yutaka Nabekawa, Yasuo Takahashi, Eiji J. Optics Applied Physics We demonstrate submicrometer focusing of isolated attosecond pulses (IAPs) in the extreme ultraviolet (XUV) region using a custom ellipsoidal mirror. The obtained focal spot sizes were verified using knife-edge measurements with a sharp silicon edge, confirming reproducible dimensions down to 0.46 $μ$m $\times$ 0.36 $μ$m (FWHM), approaching the diffraction limit. Focusing a 1.1-GW tabletop IAP source yields a peak intensity of 3 $\times$ 10$^{15}$ W/cm$^2$, and a realistic pathway toward 10$^{16}$ W/cm$^2$ is obtained by optimizing the beamline throughput. These results establish a practical route toward attosecond nonlinear optics in both gas and solid phases, driven by intense XUV fields. |
| title | Submicrometer focusing of isolated attosecond XUV pulses approaching 10$^{16}$ W/cm$^2$ |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2604.25485 |