For what is believed to be the first time, a single-longitudinal-mode passively <i>Q</i>-switched Nd:YAG microlaser is used to pump a narrow-bandwidth periodically poled lithium niobate (PPLN) optical parametric generator–optical parametric amplifier (OPG–OPA). Before amplification in the OPA, the output of the OPG stage was spectrally filtered with an air-spaced etalon, resulting in spectroscopically useful radiation (bandwidth, ∼0.05 cm<sup>-1</sup> FWHM) that was tunable in 15-cm<sup>-1</sup> segments anywhere in the signal range 6820–6220 cm<sup>-1</sup> and the idler range 2580–3180 cm<sup>-1</sup>. The ability to pump an OPG–OPA with compact, high-repetition-rate, intrinsically narrow-bandwidth microlasers is made possible by the high gain of PPLN. The result is a tunable light source that is well suited for use in portable spectroscopic gas sensors.
© 2000 Optical Society of America
K. W. Aniolek, R. L. Schmitt, T. J. Kulp, B. A. Richman, S. E. Bisson, and P. E. Powers, "Microlaser-pumped periodically poled lithium niobate optical parametric generator-optical parametric amplifier," Opt. Lett. 25, 557-559 (2000)