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We demonstrate efficient generation of narrowband (< 100 GHz) THz pulses in the nanosecond range by using difference frequency generation in organic electro-optic crystals DSTMS and OH1. The terahertz output is tunable in the range of 1–20 THz and can be used for THz imaging and spectroscopy.
We demonstrate self-pumped optical phase conjugation in Te-doped Sn2P2S6 up to a wavelength of 1.06 mum. A phase conjugate reflectivity of more than 40 percent with a very fast rise time below 100 ms has been measured.
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