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Demonstration of a low-frequency three-dimensional terahertz bullet with extreme brightness.

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2015
Author Shalaby Mostafa, Hauri Christoph P,
Project A bright and coherent keV x-ray source based on efficient high-order harmonic generation
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Original article (peer-reviewed)

Journal Nature communications
Volume (Issue) 6
Page(s) 5976 - 5976
Title of proceedings Nature communications
DOI 10.1038/ncomms6976


The brightness of a light source defines its applicability to nonlinear phenomena in science. Bright low-frequency terahertz (<5 THz) radiation confined to a diffraction-limited spot size is a present hurdle because of the broad bandwidth and long wavelengths associated with terahertz (THz) pulses and because of the lack of THz wavefront correctors. Here using a present-technology system, we employ a wavefront manipulation concept with focusing optimization leading to spatio-temporal confinement of THz energy at its physical limits to the least possible three-dimensional light bullet volume of wavelength-cubic. Our scheme relies on finding the optimum settings of pump wavefront curvature and post generation beam divergence. This leads to a regime of extremely bright PW m(-2) level THz radiation with peak fields up to 8.3 GV m(-1) and 27.7 T surpassing by far any other system. The presented results are foreseen to have a great impact on nonlinear THz applications in different science disciplines.