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Opt Lett. 2007 Feb 1;32(3):313-5.

Single-shot spatiotemporal measurements of high-field terahertz pulses.

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Lawrence Berkeley National Library, University of California, Berkeley, California 94720, USA.


The electric field profiles of broad-bandwidth coherent terahertz (THz) pulses, emitted by laser-wakefield-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 approximately or = 0.4 MV cm(-1) are observed. The measured field substructure demonstrates the manifestation of spatiotemporal coupling at focus, which affects the interpretation of THz radiation as a bunch diagnostic and in high-field pump-probe experiments.

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