Abstract
Approximately of mid-infrared (mid-IR) light around , produced by difference frequency generation (DFG) in a periodically poled lithium niobate crystal waveguide, has been used for phase-shift cavity ring-down spectroscopy measurements. The overlapping and and rotational lines of the fundamental ethene vibrational band at were probed in proof-of-principle experiments, and ethene detection was demonstrated with a minimum absorption coefficient of ( acquisition time). The compact DFG system, with a tuning range, has a considerable potential for use in trace gas detection and in molecular spectroscopy.
© 2010 Optical Society of America
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