B Green, S Kovalev, V Asgekar, G Geloni, U Lehnert, T Golz, M Kuntzsch, C Bauer, J Hauser, J Voigtlaender, B Wustmann, I Koesterke, M Schwarz, M Freitag, A Arnold, J Teichert, M Justus, W Seidel, C Ilgner, N Awari, Daniele Nicoletti, Stefan Kaiser, Yannis Laplace, Srivats Rajasekaran, Lijian Zhang, S Winnerl, H Schneider, G Schay, I Lorincz, AA Rauscher, I Radu, Sebastian Mährlein, TH Kim, JS Lee, Tobias Kampfrath, S Wall, J Heberle, A Malnasi-Csizmadia, A Steiger, AS Müller, M Helm, U Schramm, T Cowan, P Michel, Andrea Cavalleri, AS Fisher, N Stojanovic, M Gensch:
Scientific Reports 6, 22256 (2016), pp.9;
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.
The original publication is available by link DOI: 10.1038/srep22256