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Optical constants of nonlinear crystals for terahertz generation were measured by terahertz time-domain spectroscopy. Congruent and stoichiometric crystals of lithium niobate (LiNbO3) and lithium tantalate (LiTaO3) were compared in the 0.1–2 THz range. Stoichiometric lithium tantalate (SLT) was estimated as a most promising single crystal to generate efficient THz source in an ordinary polarization...
Broadband green light source using a 5.5-mm-long tandem PPLN was demonstrated. The measured wavelength and temperature bandwidth were 13nm and 100°C, respectively, which had 34.2 times broader spectral bandwidth than periodic one.
Tunable terahertz pulses were generated in fan-out periodically poled structure with QPM period of 50 to 90 μm. Center frequency was tuned from 0.94 to 1.55 THz with as narrow as band-width of 20 GHz.
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