摘要
外种子型自由电子激光具有全相干、频谱稳定、极高亮度的优点,可以实现在超小空间和超快时间尺度下对物质结构的研究。具有特殊横向相位模式的光特别是具有螺旋相位的带轨道角动量的涡旋光已经在众多科学领域有了应用,基于自由电子激光原理产生的辐射横向模式基本上为简单的高斯模式,为产生具有横向螺旋相位的相干涡旋X射线,对基于回声谐波放大型(EEHG)自由电子激光产生涡旋光方案进行了深入研究,并且根据上海软X射线自由电子激光装置(SXFEL)的参数,进行了相关方案设计和模拟研究。三维模拟结果表明,外种子型EEHG自由电子激光可以产生峰值功率可达到GW量级的相干涡旋软X射线。
External seeded free electron lasers(FELs)hold great advantage of emitting extremely high intensity,fully coherent,specially stable light,allowing researchers to study the structure of matter in ultra-small space and ultra-fast time scales.The light with a special transverse phase mode,especially vortex light with orbital angular momentum has been used in many scientific fields.However,the transverse mode of the FELs radiation is basically a simple gaussian mode.In this paper,the generation of the vortex light based on echo-enabled harmonic generation(EEHG)free electron laser is theoretically studied and the simulation studies are carried out according to the parameters of Shanghai Soft X-ray Free Electron Laser Facility(SXFEL).The results of three-dimensional simulation show that the EEHG type free electron laser can produce coherent vortex soft X rays with peak power up to GW magnitude.
作者
孙昊
冯超
刘波
Sun Hao;Feng Chao;Liu Bo(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China)
出处
《强激光与粒子束》
CAS
CSCD
北大核心
2022年第3期116-122,共7页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(12122514,11975300)。
