Abstract

A periodically poled LiNbO3 (PPLN) crystal waveguide has been used to produce up to 200μW of mid-infrared light around 3081cm1 with a wide tunability range of 35cm1. Two commercial near-infrared diode lasers at 1.064μm (pump) and 1.583μm (signal) are mixed in a nonlinear optical crystal to achieve difference frequency generation. The 48mm long directly-bonded quasi-phase-matched (QPM) PPLN waveguide shows a conversion efficiency of 12.3%W1. Applications in trace gas detection have been demonstrated for ethene, using multipass absorption coupled with wavelength modulation spectroscopy, and cavity enhanced absorption spectroscopy with a lock-in detection scheme: bandwidth reduced sensitivities of αmin=8×109 and 1.6×108cm1Hz1/2(2σ), respectively, have been achieved.

© 2009 Optical Society of America

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