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Trace gas spectroscopy using a periodically poled LiNbO/sub 3/ waveguide based mid-infrared difference frequency sensor

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6 Author(s)
D. G. Lancaster ; Rice Quantum Inst., Rice Univ., Houston, TX, USA ; F. K. Tittel ; K. P. Petrov ; A. P. Roth
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Summary form only given. Mid-infrared laser absorption spectroscopy is a promising technique for environmental trace-gas detection because many important air contaminants have strong absorption bands in that spectral region. To access the 3-5 /spl mu/m spectral region a convenient technique is difference frequency mixing in a nonlinear material, which allows the frequency shifting of readily available near infrared diode laser sources. Periodically poled LiNbO/sub 3/ (PPLN) has desirable characteristics for such difference frequency mixing, including engineerable phase matching and a high nonlinear coefficient (d/sub eff/). The use of a tapered waveguide written onto the PPLN, leads to a further enhancement of the conversion efficiency of PPLN.

Published in:

Lasers and Electro-Optics, 1999. CLEO '99. Summaries of Papers Presented at the Conference on

Date of Conference:

28-28 May 1999