Demonstration of Direct-amplification Enabled Harmonic Generation in an Ultraviolet Free-Electron Laser
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912367651061760 |
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| author | Sun, Hao Sun, Jitao Zeng, Li Liang, Yifan Tu, Lingjun Yi, Huaiqian Li, Qinming Wang, Xiaofan Yu, Yong Yang, Jiayue He, Zhigang Tian, Yuhuan Wang, Likai Wang, Zequn Wu, Guorong Zhang, Weiqing Yang, Xueming |
| author_facet | Sun, Hao Sun, Jitao Zeng, Li Liang, Yifan Tu, Lingjun Yi, Huaiqian Li, Qinming Wang, Xiaofan Yu, Yong Yang, Jiayue He, Zhigang Tian, Yuhuan Wang, Likai Wang, Zequn Wu, Guorong Zhang, Weiqing Yang, Xueming |
| contents | We report the experimental demonstration of direct-amplification enabled harmonic generation in an ultraviolet free-electron laser (FEL) driven by a low-intensity seed laser. By employing a versatile undulator configuration that enables seed amplification and harmonic generation within a unified setup, we achieved over 100-fold energy gain of the seed and observed exponential growth at the second harmonic. The results demonstrate that a sufficiently long modulator can not only amplify a weak seed but also induce strong energy modulation of the electron beam, enabling efficient harmonic bunching. This method markedly relaxes the power requirements on external seed lasers and presents a viable route toward high-repetition-rate, fully coherent FELs |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_05954 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Demonstration of Direct-amplification Enabled Harmonic Generation in an Ultraviolet Free-Electron Laser Sun, Hao Sun, Jitao Zeng, Li Liang, Yifan Tu, Lingjun Yi, Huaiqian Li, Qinming Wang, Xiaofan Yu, Yong Yang, Jiayue He, Zhigang Tian, Yuhuan Wang, Likai Wang, Zequn Wu, Guorong Zhang, Weiqing Yang, Xueming Accelerator Physics We report the experimental demonstration of direct-amplification enabled harmonic generation in an ultraviolet free-electron laser (FEL) driven by a low-intensity seed laser. By employing a versatile undulator configuration that enables seed amplification and harmonic generation within a unified setup, we achieved over 100-fold energy gain of the seed and observed exponential growth at the second harmonic. The results demonstrate that a sufficiently long modulator can not only amplify a weak seed but also induce strong energy modulation of the electron beam, enabling efficient harmonic bunching. This method markedly relaxes the power requirements on external seed lasers and presents a viable route toward high-repetition-rate, fully coherent FELs |
| title | Demonstration of Direct-amplification Enabled Harmonic Generation in an Ultraviolet Free-Electron Laser |
| topic | Accelerator Physics |
| url | https://arxiv.org/abs/2505.05954 |