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Demonstration of Direct-amplification Enabled Harmonic Generation in an Ultraviolet Free-Electron Laser

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arxiv 2505.05954 v1 pith:MUGQAZOI submitted 2025-05-09 physics.acc-ph

Demonstration of Direct-amplification Enabled Harmonic Generation in an Ultraviolet Free-Electron Laser

Hao Sun , Jitao Sun , Li Zeng , Yifan Liang , Lingjun Tu , Huaiqian Yi , Qinming Li , Xiaofan Wang
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Yong Yu Jiayue Yang Zhigang He Yuhuan Tian Likai Wang Zequn Wang Guorong Wu Weiqing Zhang Xueming Yang
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classification physics.acc-ph
keywords harmonicseedgenerationlaserdemonstrationdirect-amplificationenabledenergy
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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

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