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Experimental setup for the pump-generation measurements.
Wave forms of terahertz radiation observed at a series of pump-generation delay times. The inset shows the peak amplitude of the radiated terahertz pulse as a function of the delay time; the solid curve is the calculated data using the model described in the text. To obtain this agreement, we use a trapping time constant of .
Fourier spectra of the terahertz pulses at a series of pump-generation delay times deduced from Fig. 2; the inset shows the peak position of the emission spectra as a function of delay time.
Peak amplitude of the radiated terahertz pulse as a function of the pump power absorbed by the GaAs. The solid curve is the calculated data.
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