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Microlaser-pumped periodically poled lithium niobate optical parametric generator–optical parametric amplifier

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Abstract

For what is believed to be the first time, a single-longitudinal-mode passively Q-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-1 FWHM) that was tunable in 15cm-1 segments anywhere in the signal range 68206220 cm-1 and the idler range 25803180 cm-1. 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

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