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Both electronic and phonon coherence in bulk GaAs is studied using an interference experiment of electron-phonon coupled states induced by two phase-locked femtosecond pulses. Full coherence remains within ∼ 45 fs at room temperature.
We have developed injection-seeded KTP optical parametric generator for DAST-DFG terahertz-wave source. Using a microchip Nd:YAG laser, the energy conversion efficiency of 10% and peak-power output of 2.5 MW were obtained at 1300 nm.
Terahertz (THz) wave generation based on nonlinear frequency conversion is a promising method for realizing a tunable monochromatic high-power THz-wave source. Unfortunately, many nonlinear crystals have strong absorption in the THz frequency region. This limits efficient and widely tunable THz-wave generation. The Cherenkov phase-matching method is one of the most promising techniques for overcoming...
We have realized tunable terahertz wave parametric generator by using microchip Nd:YAG laser and observed output terahertz wave with tuning range of 0.9 - 3 THz, peak power of about 100 mW, and detected by schottky barrier diode.
We have realized palmtop and tunable THz-wave parametric generator and observed output THz-wave with tuning range of 1-3 THz, with power of more than 100 mW (peak), linewidth of less than 10 GHz.
We developed two new kinds of terahertz-wave parametric generators (TPG) by using compact pump sources. One TPG generates high energy and broadband THz-waves with high stability, the other has a potential to be a narrow-linewidth injection-seeded TPG.
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