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We present a study on THz generation in lithium niobate pumped by a powerfuland versatile Yb:CaF2 laser. The unique laser system delivers transform-limitedpulses of variable duration (0.38-0.65 ps) with pulse energy of up to 15 mJ ata center wavelength of 1030 nm. From theoretical investigations it is expectedthat those laser parameters are ideally suited for efficient THz generation.Here we present experimental results on both the conversion efficiency and theTHz spectral shape for variable pump pulse durations and for different crystaltemperatures down to 25 K. We experimentally verify the optimum pump parametersfor most efficient and broadband THz generation.

High-energy femtosecond Yb:CaF2 laser for efficient THz pulse generation in lithium niobate