Ultrafast pump–probe experiments open the possibility to track fundamental material behaviour, such as changes in electronic configuration, in real time. To date, most of these experiments are performed using an electron or a high-energy photon beam that is synchronized to an infrared laser pulse. Entirely new opportunities can be explored if not only a single, but multiple synchronized, ultrashort, high-energy beams are used. However, this requires advanced radiation sources that are capable of producing dual-energy electron beams, for example. Here, we demonstrate simultaneous generation of twin-electron beams from a single compact laser wakefield accelerator. The energy of each beam can be individually adjusted over a wide range and our analysis shows that the bunch lengths and their delay inherently amount to femtoseconds. Our proof-of-concept results demonstrate an elegant way to perform multi-beam experiments in the future on a laboratory scale.
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This work was supported by DFG through the Cluster of Excellence Munich-Centre for Advanced Photonics (MAP EXC 158), DFG-Project Transregio TR-18 funding schemes, by EURATOM-IPP and the Max-Planck-Society. L.V. acknowledges the support by a grant from the Swedish Research Council (2016-05409). The authors thank F. Krausz for helpful comments. A.D. thanks I. Andriyash (WIS) for support with Chimera.
The authors declare no competing interests.
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Wenz, J., Döpp, A., Khrennikov, K. et al. Dual-energy electron beams from a compact laser-driven accelerator. Nat. Photonics 13, 263–269 (2019). https://doi.org/10.1038/s41566-019-0356-z
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