Demonstration of direct-amplification enabled harmonic generation in an ultraviolet free-electron laser
Abstract
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 cannot 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.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (17)
Hao Sun
Jitao Sun
Institute of Advanced Light Source Facilities 1 , Shenzhen, Shenzhen 518107,
Li Zeng
The Institute for Advanced Studies (IAS), College of Chemistry and Molecular Sciences
Yifan Liang
Hefei National Research Center for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum Physics, New Cornerstone Science Laboratory
Lingjun Tu
Institute of Advanced Light Source Facilities 1 , Shenzhen, Shenzhen 518107,
Huaiqian Yi
Institute of Advanced Light Source Facilities 1 , Shenzhen, Shenzhen 518107,
Qinming Li
Xiaofan Wang
Yong Yu
Jiayue Yang
State Key Laboratory of Chemical Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics
Zhigang He
F.M. Kirby Neurobiology Center, Boston Children’s Hospital
Yuhuan Tian
State Key Laboratory of Chemical Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences 2 , Dalian 116023,
Likai Wang
School of Chemistry and Chemical Engineering
Zequn Wang
Key Laboratory of Materials Modification by Laser, Electron, and Ion Beams (Ministry of Education), School of Physics, Dalian University of Technology , Dalian 116024,
Guorong Wu
Weiqing Zhang
Xueming Yang
State Key Laboratory of Chemical Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics