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We demonstrate record conversion efficiencies of up to 0.9 percent fornarrowband (1 percent relative bandwidth) THz generation by strongly-cascadeddifference frequency generation. These results are achieved using a novel lasersource, customized for high efficiencies, with two narrow spectral lines ofvariable separation and pulse duration (250 ps). THz generation in 5 percentMgO doped PPLN crystals of varying poling period was explored at cryogenic androom temperature operation as well as different crystal lengths. This workaddresses an increasing demand for high-field THz pulses which has, up to now,been largely limited by low optical-to-THz conversion efficiencies.

Highly efficient narrowband terahertz generation driven by a two-spectral-line laser in PPLN