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First Lasing and Stable Operation of a Direct-Amplification Enabled Harmonic Generation Free-Electron laser
Zheng Qi, Junhao Liu, Lanpeng Ni, Tao Liu, Zhen Wang, Kaiqing Zhang, Hanxiang Yang, Zhangfeng Gao, Nanshun Huang, Si Chen, Hang Luo, Yaozong Xiao, Cheng Yu, Yongmei Wen, Fei Gao, Yangyang Lei, Huan Zhao, Yanyan Zhu, Liping Sun, Weiyi Yin, Xingtao Wang, Taihe Lan, Xiaoqing Liu, Lie Feng, Wenyan Zhang, Ximing Zhang, Bin Li, Chao Feng, Bo Liu, Zhentang Zhao

First Lasing and Stable Operation of a Direct-Amplification Enabled Harmonic Generation Free-Electron laser
Seeded free-electron lasers (FELs) capable of operating at repetition rates up to the MHz level are in high demand for advanced time-resolved spectroscopies, which require both full longitudinal coherence and high average photon flux in the extreme ultraviolet (EUV) and x-ray regimes. However, conventional external-seed laser systems cannot sustain MHz operation with sufficient hundreds of megawatts peak power requirement due to their limited total power. Here, we report the first lasing and st…