2026/07/29 by Ichiro Inoue, Ulrike Boesenberg, Rustam Rysov +41
Physics and Astronomy · #physics.optics
arxiv created 2026/07/31 · arxiv updated 2026/08/03
By combining hard x-ray attosecond pulses from the European XFEL with total-reflection focusing x-ray optics, we generated nanofocused hard x-ray attosecond pulses with intensities and fluences comparable to the highest values attained in the hard x-ray regime. A peak intensity on the order of 1020 W/cm2 is confirmed through the observation of saturation in amplified spontaneous emission from copper atoms. These x-ray pulses enable new scientific opportunities, including the exploration of higher-order nonlinear light--matter interactions, damage-free structure determination, and coherent control of atoms and molecules.