Abstract

We propose a novel quasi-phase-matched (QPM) device that can generate unequally spaced multiple wavelengths. Unequally spaced multiple QPM peaks can be obtained by employing the optimized phase modulation of a periodic domain structure. We fabricated a $\mathrm{Li}\mathrm{Nb}{\mathrm{O}}_3$ waveguide device for $3.2–3.4\mu \mathrm{m}$ band difference frequency generation based on the design. Using the multiple mid-infrared outputs, we demonstrate the detection of multiple hydrocarbon gases, namely, methane, ethylene, and ethane.

© 2007 Optical Society of America

Widely tunable 3.4 μm band difference frequency generation using apodized χ⁽²⁾ grating

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