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Coherent length at as a function of optical wavelength calculated using the parameters of various zinc-blende semiconductors (Ref. 13).
(a) Optical group index and (b) refractive index in the THz region in GaAs, (c) coherent length at vs THz frequency.
Sketch of the experimental setup. WP is a Wolston prism. In the measurement of the probe, we set the crystal for frequency doubling and a wave plate at the mark of SH.
Temporal wave form and power spectrum of THz radiation from GaAs using laser excitation. Detection is achieved with EO sampling using a GaAs crystal and sampling pulses.
Temporal wave form of the THz radiation from a GaAs emitter using laser excitation. For EO sampling, we use (a) ZnTe crystal with thickness and sampling pulses, (b) GaAs crystal with thickness and sampling pulses.
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