Abstract

Approximately 200μW of mid-infrared (mid-IR) light around 3081cm1, 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 C122H4 PR0(14) and RP6(10) and C12H2C13H2 QP3(10) rotational lines of the ν9 fundamental ethene vibrational band at 3081.0016cm1 were probed in proof-of-principle experiments, and ethene detection was demonstrated with a minimum absorption coefficient of 1.4×107cm1 (4  min acquisition time). The compact DFG system, with a >35cm1 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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