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

作　　者：Zhen Wang Chao Feng 

机构地区：[1]Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai,China

出　　处：《High Power Laser Science and Engineering》2023年第3期8-14,共7页高功率激光科学与工程（英文版）

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

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.

关 键 词：free electron laser frequency beating isolated attosecond pulses soft X-ray 

分 类 号：TN248[电子电信—物理电子学]