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Optical rectification in β-BBO

Optical properties of β-BBO were studied in the range of 0.2 – 2.5 THz at RT and 81 K by THz–TDS. Recorded dispersions were approximated in the form of Sellmeier equations. Phasematched down-conversion, as well as SHG within the THz range, are found possible. Efficient optical rectification into long wavelength region was experimentally observed.