Abstract
We report the use of an optoelectronic system for the measurement of THz pulses by use of chirped pulse technology. This novel system measures the spatio-temporal distribution of a free-space pulsed radiation with an unprecedented data acquisition rate. Using a linearly-chirped optical probe pulse in free-space for electro-optic measurements, a temporal waveform of a co-propagating terahertz (THz) field is linearly encoded onto the frequency spectrum of the optical probe pulse, and then decoded by dispersing the probe beam from a grating to a detector array. Acquisition of picosecond THz field pulses without using mechanical time-delay devices has been achieved. A single-shot electro-optic measurement of the temporal waveform of a THz pulse has been demonstrated. Unparalleled by other THz sampling techniques, this single-shot method provides what is believed to be the highest possible data-acquisition rate.
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