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The frequency range between 5 THz and 15 THz is a spectral region of particular interest since it includes various fundamental excitations in condensed-matter systems such as phonons in solids, molecular vibrations and low-energy collective modes of correlated materials. However, the generation and coherent detection of highly stable THz transients for ultrafast experiments in this spectral interval...
We demonstrate ultrafast temporal slicing of phase-locked multi-THz pulses using a photoinduced electron-hole plasma in germanium. This approach enables us to extract single-cycle transients with a peak electric field of 10 MV/cm from a multi-cycle waveform at a carrier frequency of 24 THz.
We present recent advances in the generation of highly intense multiterahertz transients and their application to nonlinear spectroscopy of bulk semiconductors. An optimized scheme of parametric amplification results in broadband single- or few-cycle terahertz transients with peak electric fields up to 10 or 25 MV/cm, respectively. Time-resolved four-wave mixing terahertz spectroscopy of InSb far...
Broadband parametric amplification of 1.3-µm pulses in GaSe crystals provides intense single-cycle idler transients covering the 1–60 THz window with peak amplitudes above 10 MV/cm. Electro-optic sampling directly monitors the field of the phase-stable waveforms.
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