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to the electric field of the incident beam transients at the sampling moment. The EO sampling technique usually requires optical probe pulses to be synchronized to the THz radiation being detected. Usually, femtosecond pulses from a Ti:sapphire laser are split into two: one is used to generate THz transients by exciting PC switches or nonlinear materials, the other is used as the probe pulse. The synchronization maintains the temporal relation between THz transients and the probe pulses. By scanning the time delay between the THz transient and probe pulse, an EO signal reproduces the wavefor