Abstract
Temporal waveform transformation of terahertz electromagnetic pulses near the focus was studied by experiments and simulations. The terahertz pulses were generated by a large-aperture photoconductive emitter, and focused by an off-axis parabolic mirror. Changes of the temporal waveforms due to the propagation near the focus were measured using the electro-optic sampling method. Experimentally observed waveforms were compared with those of simulations based on the Gaussian beam model, and good agreement between them was obtained. A simple analytical expression describing the amplitude and the temporal shape of the focused THz waveform was also derived.
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