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The Fourier spectrum of the THz radiation transients generated and detected by 70 fs, 1030 nm laser pulses in the photoconductive components made from the GaBiAs layer. Inset - THz pulse waveform.
Average THz output power dependence on the bias voltage at different optical pump powers (a) and on the optical pump power at the bias voltage of 65 V (b).
THz transients (a) and corresponding Fourier spectra (b) for three different laser pulse durations (indicated in the panels). Beams with average powers of 8 and 11 mW were used for the photoexcitation of the THz emitter and the detector, respectively.
20 dB bandwidth of THz-TDS system as a function of the optical pulse duration. Solid lines - calculations in the case of different carrier lifetimes (indicated in the figure) in the detector. Full points - experimental results obtained with the Yb:fiber laser. A hollow circle - experimental result obtained with the Yb:KGW laser.
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