Single-shot spatiotemporal measurements of high-field terahertz pulses (original) (raw)

The electric field profiles of broad-bandwidth coherent terahertz (THz) pulses, emitted by laserwakefield-accelerated electron bunches, are studied. The near-single-cycle THz pulses are measured with two single-shot techniques in the temporal and spatial domains. Spectra of 0 − 6 THz and peak fields up to 0.4 MV cm −1 are observed. The measured field substructure demonstrates the manifestation of spatio-temporal coupling at focus, which affects the interpretation of THz radiation as a bunch diagnostic and in high-field pump-probe experiments. A ray-based model confirms the coupling.

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