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We demonstrate efficient multicycle terahertz pulse generation at 14.6 THzfrom large-area lithium niobate crystals by using high-energy (up to 2 J)femtosecond Ti:sapphire laser pulses. Such terahertz radiation is produced byphase-matched optical rectification in lithium niobate. Experimentally, weachieve maximal terahertz energy of 0.71 mJ with conversion efficiency of$\sim$0.04%. We also find that the effective interaction length for optimalterahertz conversion is fundamentally limited by terahertz absorption, laserpulse stretching by material dispersion, and terahertz-induced nonlinearcascading effects on the driving laser pulse.

Generation of 0.7 mJ multicycle 15 THz radiation by phase-matched optical rectification in lithium niobate