Dispersive Fourier method gives access to spectral information by mapping them in the time domain. This facilitates shot-to-shot spectroscopy of rapidly changing systems. We adapted this technique to demonstrate time-resolved THz spectroscopy at 50 kHz repetition rate by encoding the THz waveform onto the spectral components of spectrally broadened (NIR) ultrafast laser pulses.
The rapid acquisition of terahertz (THz) time-domain waveforms is a significant challenge in the study of fast and non-reproducible phenomena. To increase data acquisition rates, the THz waveform can be encoded on spectral components of individual near-infrared (NIR) ultrafast laser pulses. By using dispersive Fourier transform method, where spectral information are mapped in the time domain, we demonstrate time-resolved THz-spectroscopy at an unprecedented rate of 50 kHz. With this technique, we resolve sub-millisecond dynamics of carriers in silicon injected by successive resonant pulses as a saturation density is established.
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