Optical beat notes assisted attosecond soft X-ray pulse generation in high-gain free electron lasers
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作者
Wang, Zhen; Feng, Chao
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刊物名称
HIGH POWER LASER SCIENCE AND ENGINEERING
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年、卷、文献号
2023, 11, 2052-3289
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关键词
Wang, Zhen; Feng, Chao
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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.
