Optical beat notes assisted attosecond soft X-ray pulse generation in high-gain free electron lasers

作     者：Zhen Wang Chao Feng Zhen Wang;Chao Feng

作者机构：Shanghai Advanced Research InstituteChinese Academy of SciencesShanghaiChina 

出 版 物：《高功率激光科学与工程:英文版》 (High Power Laser Science and Engineering)

年 卷 期：2023年第11卷第3期

页      面：8-14页

核心收录：

学科分类：08[工学] 0804[工学-仪器科学与技术] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (Nos. 11905275, 11775294, 12122514, and 11975300) the Youth Innovation Promotion Association CAS 

主　　题：free electron laser frequency beating isolated attosecond pulses soft X-ray 

摘      要：Attosecond soft X-ray pulses are of great importance for the study of ultrafast electronic phenomena.In this paper,a feasible method is proposed to generate isolated fully coherent attosecond soft X-ray free electron laser via optical frequency beating.Two optical lasers with the opposite frequency chirps are used to induce a gradient frequency energy modulation,which helps to generate a gradually varied spacing electron pulse train.Subsequently,the undulator sections with electron beam delay lines are used to amplify the target ultra-short radiation.Numerical start-to-end simulations have been performed and the results demonstrate that an isolated soft X-ray pulse with the peak power of 330 GW and pulse duration of 620 as can be achieved by the proposed technique.