Abstract

The results of a simple scheme to generate continuously tunable pulsed narrow-bandwidth (less than 0.1 cm <sup>-1</sup>) 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 0.08 cm <sup>-1</sup> and tunable over 18 cm <sup>-1</sup> 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 180 µJ of signal at 1.6 µm and 60 µJ of idler at 3.3 µm .

© 1998 Optical Society of America

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