Abstract
A periodically poled (PPLN) crystal waveguide has been used to produce up to of mid-infrared light around with a wide tunability range of . Two commercial near-infrared diode lasers at (pump) and (signal) are mixed in a nonlinear optical crystal to achieve difference frequency generation. The long directly-bonded quasi-phase-matched (QPM) PPLN waveguide shows a conversion efficiency of . 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 and , respectively, have been achieved.
© 2009 Optical Society of America
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