期刊
NATURE COMMUNICATIONS
卷 4, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/ncomms3421
关键词
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资金
- DFG [TR18 A12, B9, GRK1203]
- BMBF [05K10SJ2, 03ZIK052]
- TMBWK [B154-09030, B 715-08008]
- European Regional Development Fund (EFRE)
Laser-plasma particle accelerators could provide more compact sources of high-energy radiation than conventional accelerators. Moreover, because they deliver radiation in femtosecond pulses, they could improve the time resolution of X-ray absorption techniques. Here we show that we can measure and control the polarization of ultra-short, broad-band keV photon pulses emitted from a laser-plasma-based betatron source. The electron trajectories and hence the polarization of the emitted X-rays are experimentally controlled by the pulse-front tilt of the driving laser pulses. Particle-in-cell simulations show that an asymmetric plasma wave can be driven by a tilted pulse front and a non-symmetric intensity distribution of the focal spot. Both lead to a notable off-axis electron injection followed by collective electron-betatron oscillations. We expect that our method for an all-optical steering is not only useful for plasma-based X-ray sources but also has significance for future laser-based particle accelerators.
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