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Sci Rep. 2016 Feb 29;6:22256. doi: 10.1038/srep22256.

High-Field High-Repetition-Rate Sources for the Coherent THz Control of Matter.

Author information

1
Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, 01328 Dresden, Germany.
2
Deutsches Elektronen Synchrotron, Notkestr. 85, 22607 Hamburg, Germany.
3
S. P. Pune University, Pune 411 007, India.
4
European XFEL GmbH, Albert-Einstein-Ring 19, 22761 Hamburg, Germany.
5
Technische Universität Dresden, 01062 Dresden, Germany.
6
Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.
7
Karlsruhe Institute of Technology, Kaiser Str. 12, 76131 Karlsruhe, Germany.
8
University of Groningen, 9747 AG Groningen, Netherlands.
9
Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.
10
Max Planck Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany.
11
Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.
12
Eotvos Lorand University, Pazmany s 1/C. 1117 Budapest, Hungary.
13
Helmholtz-Zentrum Berlin, Albert-Einstein Str. 15, 12489 Berlin, Germany.
14
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.
15
Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, Korea.
16
ICFO-Institute of Photonic Sciences, Av. Carl Friedrich Gauss 3, 08860 Castelldefels (Barcelona), Spain.
17
Physikalisch-Technische Bundesanstalt (PTB), Abbestr 2-12, 10587 Berlin, Germany.
18
SLAC National Accelerator Laboratory, 2575 Sand Hill Rd, Menlo Park, California 94025, USA.

Abstract

Ultrashort flashes of THz light with low photon energies of a few meV, but strong electric or magnetic field transients have recently been employed to prepare various fascinating nonequilibrium states in matter. Here we present a new class of sources based on superradiant enhancement of radiation from relativistic electron bunches in a compact electron accelerator that we believe will revolutionize experiments in this field. Our prototype source generates high-field THz pulses at unprecedented quasi-continuous-wave repetition rates up to the MHz regime. We demonstrate parameters that exceed state-of-the-art laser-based sources by more than 2 orders of magnitude. The peak fields and the repetition rates are highly scalable and once fully operational this type of sources will routinely provide 1 MV/cm electric fields and 0.3 T magnetic fields at repetition rates of few 100 kHz. We benchmark the unique properties by performing a resonant coherent THz control experiment with few 10 fs resolution.

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