Mid-Ir Ethene Detection Using a Quasi-Phase Matched LiNbO_3 Waveguide

Details Mid-Ir Ethene Detection Using a Quasi-Phase Matched LiNbO_3 Waveguide Mid-Ir Ethene Detection Using a Quasi-Phase Matched LiNbO_3 Waveguide

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mss..confetd02g&link_type=abstract

"International Symposium On Molecular Spectroscopy, 64th Meeting, Held 22-26 June, 2009 at Ohio State University. http://molspec

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Mini-Symposium: Cavity Enhanced Spectroscopy

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A periodically poled LiNbO_3 waveguide has been used to produce up to 200 μW of mid-infrared light around 3081 cm^{-1} with a wide tunability range of >33 cm^{-1}. Two commercial near-infrared diode lasers at 1.064 μm (pump) and 1.583 μm (signal) are mixed in a nonlinear optical crystal to achieve difference frequency generation. The 48 mm long direct-bonded quasi-phase matched periodically poled LiNbO_{3} waveguide shows a conversion efficiency of 12.3 %/W. The radiation sits in an important window of the mid-infrared spectral region, where a large number of fundamental vibrations of several hydrocarbons occur. Applications in trace gas detection have been demonstrated for ethene, using multi-pass absorption coupled with wavelength modulation spectroscopy to reach a minimum absorption coefficient of 3 × 10^{-7} cm^{-1} Hz^{-1/2}. The relatively high power of the mid-infrared idler radiation obtained shows great potential for higher sensitive techniques such as cavity enhanced absorption spectroscopy and cavity ring-down spectroscopy, and preliminary results will be presented.
L. Ciaffoni, R. Grilli, G. Hancock, A.J. Orr-Ewing, R. Peverall and G. A. D. Ritchie Appl. Phys. B 94, 517-525, 2009.

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