The results of a simple scheme to generate continuously tunable pulsed narrow-bandwidth (less than ) light in the infrared are presented. A periodically poled lithium niobate (PPLN) optical parametric amplifier is seeded with the filtered output of a PPLN optical parametric generator. A high-finesse Fabry–Perot etalon is used as the filtering element, giving bandwidths as narrow as and tunable over without any adjustments to the PPLN crystals. High efficiency is obtained with a 15-ns 1-kHz Nd:YAG laser, giving energies of up to of signal at and of idler at .
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