近日，美国SLAC国家加速器实验室的Agostino Marinelli&James P. Cryan及其研究团队取得一项新进展。经过不懈努力，他们成功利用级联超辐射自由电子激光器产生太瓦级阿秒x射线脉冲。相关研究成果已于2024年5月13日在国际知名学术期刊《自然—光子学》上发表。

该研究团队利用两级级联X射线自由电子激光器产生太瓦级孤立阿秒脉冲。这些脉冲在软X射线区域的平均能量超过100μJ。时间剖面的特征与角度纹理测量，揭示了1.1TW的最大峰值功率。这项研究数据显示，阿秒X射线脉冲的平均峰值功率比先前报道的结果增加了一个数量级，并提供了X射线中类似孤子的超辐射行为的有力证据。

据悉，强阿秒X射线脉冲是超快非线性光谱和衍射成像的关键。

附：英文原文

Title: Terawatt-scale attosecond X-ray pulses from a cascaded superradiant free-electron laser

Author: Franz, Paris, Li, Siqi, Driver, Taran, Robles, River R., Cesar, David, Isele, Erik, Guo, Zhaoheng, Wang, Jun, Duris, Joseph P., Larsen, Kirk, Glownia, James M., Cheng, Xinxin, Hoffmann, Matthias C., Li, Xiang, Lin, Ming-Fu, Kamalov, Andrei, Obaid, Razib, Summers, Adam, Sudar, Nick, Thierstein, Emily, Zhang, Zhen, Kling, Matthias F., Huang, Zhirong, Cryan, James P., Marinelli, Agostino

Issue&Volume: 2024-05-13

Abstract: Intense attosecond X-ray pulses are key for ultrafast nonlinear spectroscopy and diffractive imaging. Here we demonstrate the generation of terawatt-scale isolated attosecond pulses with a two-stage cascaded X-ray free-electron laser. These pulses have a median energy in excess of 100μJ in the soft X-ray region. The temporal profile is characterized with an angular streaking measurement, revealing a maximum peak power of 1.1TW. Our data show an increase in the average peak power of attosecond X-ray pulses by one order of magnitude over previous reported results and provide strong evidence of soliton-like superradiant behaviour in the X-ray regime.

DOI: 10.1038/s41566-024-01427-w

Source: https://www.nature.com/articles/s41566-024-01427-w