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Fully coherent short wavelength free-electron laser driven by a single sub-microjoule seed

Fuente: arXiv

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Bibliographic Details
Main Authors:	Ni, Lanpeng, Qi, Zheng, Wang, Xingtao, Yin, Weiyi, Wang, Zhen, Zhang, Kaiqing, Gao, Zhangfeng, Huang, Nanshun, Yang, Hanxiang, Luo, Hang, Chen, Si, Liu, Junhao, Xiao, Yaozong, Tu, Lingjun, Wang, Xiaofan, Yu, Cheng, Wen, Yongmei, Gao, Fei, Lei, Yangyang, Chen, Jian, Zhao, Huan, Liu, Xiaoqing, Feng, Lie, Zhu, Yanyan, Xu, Jiaqiang, Sun, Liping, Zhang, Wenyan, Wang, Yue, Lan, Taihe, Zhang, Ximing, Li, Bin, Liu, Tao, Feng, Chao, Xiang, Dao, Liu, Bo, Zhao, Zhentang
Format:	Preprint
Published:	2026
Subjects:	Accelerator Physics Optics
Online Access:	Acceder al recurso
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_version_	1866910264174051328
author	Ni, Lanpeng Qi, Zheng Wang, Xingtao Yin, Weiyi Wang, Zhen Zhang, Kaiqing Gao, Zhangfeng Huang, Nanshun Yang, Hanxiang Luo, Hang Chen, Si Liu, Junhao Xiao, Yaozong Tu, Lingjun Wang, Xiaofan Yu, Cheng Wen, Yongmei Gao, Fei Lei, Yangyang Chen, Jian Zhao, Huan Liu, Xiaoqing Feng, Lie Zhu, Yanyan Xu, Jiaqiang Sun, Liping Zhang, Wenyan Wang, Yue Lan, Taihe Zhang, Ximing Li, Bin Liu, Tao Feng, Chao Xiang, Dao Liu, Bo Zhao, Zhentang
author_facet	Ni, Lanpeng Qi, Zheng Wang, Xingtao Yin, Weiyi Wang, Zhen Zhang, Kaiqing Gao, Zhangfeng Huang, Nanshun Yang, Hanxiang Luo, Hang Chen, Si Liu, Junhao Xiao, Yaozong Tu, Lingjun Wang, Xiaofan Yu, Cheng Wen, Yongmei Gao, Fei Lei, Yangyang Chen, Jian Zhao, Huan Liu, Xiaoqing Feng, Lie Zhu, Yanyan Xu, Jiaqiang Sun, Liping Zhang, Wenyan Wang, Yue Lan, Taihe Zhang, Ximing Li, Bin Liu, Tao Feng, Chao Xiang, Dao Liu, Bo Zhao, Zhentang
contents	High-repetition-rate, fully coherent extreme-ultraviolet (EUV) and X-ray free-electron lasers (FELs) are essential for advanced time-resolved ultrafast spectroscopies. While external seeding serves as the standard technique to achieve precise temporal coherence, conventional methods demand hundred-megawatt peak-power laser systems. Furthermore, advanced configurations like echo-enabled harmonic generation (EEHG) introduce the severe complexities of dual-laser synchronization. Together, these requirements fundamentally restrict operations to kilohertz repetition rates and compromise overall system stability. Here, we experimentally demonstrate a fully coherent EEHG-FEL driven by a single, sub-microjoule seed laser. By employing a direct-amplification enabled harmonic generation technique, we utilize an initial 0.4 microJ (2 MW peak power) ultraviolet seed to directly drive coherent lasing at nanometer wavelengths. By eliminating the need for extreme peak powers and multiple synchronized lasers, this approach significantly simplifies the seeding architecture and provides a practical and robust pathway toward megahertz-class, fully coherent EUV and X-ray light sources.
format	Preprint
id	arxiv_https___arxiv_org_abs_2605_27821
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Fully coherent short wavelength free-electron laser driven by a single sub-microjoule seed Ni, Lanpeng Qi, Zheng Wang, Xingtao Yin, Weiyi Wang, Zhen Zhang, Kaiqing Gao, Zhangfeng Huang, Nanshun Yang, Hanxiang Luo, Hang Chen, Si Liu, Junhao Xiao, Yaozong Tu, Lingjun Wang, Xiaofan Yu, Cheng Wen, Yongmei Gao, Fei Lei, Yangyang Chen, Jian Zhao, Huan Liu, Xiaoqing Feng, Lie Zhu, Yanyan Xu, Jiaqiang Sun, Liping Zhang, Wenyan Wang, Yue Lan, Taihe Zhang, Ximing Li, Bin Liu, Tao Feng, Chao Xiang, Dao Liu, Bo Zhao, Zhentang Accelerator Physics Optics High-repetition-rate, fully coherent extreme-ultraviolet (EUV) and X-ray free-electron lasers (FELs) are essential for advanced time-resolved ultrafast spectroscopies. While external seeding serves as the standard technique to achieve precise temporal coherence, conventional methods demand hundred-megawatt peak-power laser systems. Furthermore, advanced configurations like echo-enabled harmonic generation (EEHG) introduce the severe complexities of dual-laser synchronization. Together, these requirements fundamentally restrict operations to kilohertz repetition rates and compromise overall system stability. Here, we experimentally demonstrate a fully coherent EEHG-FEL driven by a single, sub-microjoule seed laser. By employing a direct-amplification enabled harmonic generation technique, we utilize an initial 0.4 microJ (2 MW peak power) ultraviolet seed to directly drive coherent lasing at nanometer wavelengths. By eliminating the need for extreme peak powers and multiple synchronized lasers, this approach significantly simplifies the seeding architecture and provides a practical and robust pathway toward megahertz-class, fully coherent EUV and X-ray light sources.
title	Fully coherent short wavelength free-electron laser driven by a single sub-microjoule seed
topic	Accelerator Physics Optics
url	https://arxiv.org/abs/2605.27821