Multi-stage harmonic cascade at seeded free-electron lasers

被引:0
作者
Zeng, Li [1 ]
Yu, Yong [1 ]
Wang, Xiaofan [1 ]
Li, Qinming [1 ]
Sun, Jitao [2 ,3 ]
Li, Xinmeng [2 ,3 ]
He, Zhigang [2 ]
Yang, Jiayue [2 ]
Wu, Guorong [2 ]
Zhang, Weiqing [2 ]
Yang, Xueming [1 ,2 ,4 ]
机构
[1] Inst Adv Sci Facil, Shenzhen 518107, Peoples R China
[2] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
[3] Univ Chinese Acad Sci, Beijing, Peoples R China
[4] Southern Univ Sci & Technol, Coll Sci, Shenzhen, Peoples R China
来源
HIGH POWER LASER SCIENCE AND ENGINEERING | 2025年 / 12卷
基金
中国国家自然科学基金;
关键词
free-electron laser; harmonic lasing; high-gain harmonic generation; water window; EXTREME-ULTRAVIOLET; COHERENT CONTROL; GENERATION; GAIN; OPERATION; REGIME;
D O I
10.1017/hpl.2024.76
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
External seeded free-electron lasers (FELs) have exhibited substantial progress in diverse applications over the last decade. However, the frequency up-conversion efficiency in single-stage seeded FELs, particularly in high-gain harmonic generation (HGHG), remains constrained to a modest level. This limitation restricts its capability to conduct experiments within the 'water window'. This paper presents a novel method for generating coherent X-ray FEL pulses in the water window region based on the HGHG scheme with multi-stage harmonic cascade. Without any additional modifications to the HGHG configuration, simulation results demonstrate the generation of intense 3 nm coherent FEL radiation using an external ultraviolet seed laser. This indicates an increase of the harmonic conversion number to approximately 90. A preliminary experiment is performed to evaluate the feasibility of this method. The proposed approach could potentially serve as an efficient method to broaden the wavelength coverage accessible to both existing and planned seeded X-ray FEL facilities.
引用
收藏
页数:10
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