Abstract
We present a detailed study of subpicosecond pulse generation by nonuniform illumination of photoconductive switches on semi-insulating GaAs. The amplitude dependence of such pulses on bias voltage and light intensity was examined in detail. A complete spatial mapping of the excitation area indicates that such pulse generation is due to the depletion of electrical held by photocarriers in the illuminated section of the gap. Picosecond pulses were generated by this method on series gaps in a coplanar waveguide for the first time and were found to contain balanced, odd modes only.
© 1993 Optical Society of America
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