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High voltage (∼1 kV) pulses having 12-ps rise time and a duration of 70 ps have been generated and propagated along a suspended-strip vacuum waveguide. The temporal and spatial profiles of the electric field inside the waveguide have been measured using electro-optic sampling, with resolutions of 10 ps and ∼1 mm, respectively. The field is found to be predominantly composed of the TEM00 mode, and there is no observable temporal broadening of the ultrashort pulse over a propagation distance of several centimeters. The temporal profile exhibits significant high-frequency modulation which is attributed to the LC resonance of the photoconductive switch.
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D. G. Stearns (1989) studied this question.
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