Gigawatt-class, tabletop, isolated-attosecond-pulse light source

Powerful and stable attosecond pulse sources have the potential for wide application in ultrafast science. For this purpose, we have produced a soft X-ray supercontinuum with a pulse energy of 0.24 mu J using high-order harmonics from a multi-terawatt, 10 Hz, three-channel waveform synthesizer [Sci. Adv. 6, eaay2802 (2020)]. Here, we report an attosecond streaking scheme that is designed to measure this isolated attosecond pulse at a low-repetition rate. We retrieved a pulse duration of 226 attoseconds (as), demonstrating the realization of 1.1 gigawatt isolated as pulses on a tabletop, which compares favorably to an X-ray free-electron laser in a large facility. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement