Abstract

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 $0–6\mathrm{THz}$ and peak fields up to $\simeq 0.4\mathrm{MV}{\mathrm{cm}}^{-1}$ 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.

© 2007 Optical Society of America

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